rates and ratio problems
amy needs 1 hour to do a certain job. her dad can do the same job in 30 min. how many minute will it take them to do the job of they work together at given rates?
amy takes an hour so she does
1/60 of yhe job per minute
father takes 30 mins so he does
1/30 of the job per minute
 
together they complete
1/60 + 1/30 per minute 
or 3/60 of the job per minute
 
(3/60)x = 1
x = 60/3
x = 20 minutes
what’s your day rate. hint: here, we will proceed by finding out the relative speed between the two cars and then using the formula i.e., time taken$ = \dfrac{{{\text{distance travelled}}}}{{{\text{speed}}}}$ to determine after how many hours these cars will meet each other.complete step-by-step answer:given, distance between the two cars d=160 kmstarting time for both the cars when they left their respective initial positions a and b is 8:10 amspeed of the first car, x=50 km per hourspeed of the second car, y=30 km per hourin order to obtain the relative speed between these two cars which are moving towards each other (i.e., in opposite directions), the individual speeds of these cars will be added.so, the relative speed between the two given cars, r= x+y=50+30=80 km per houras we know that, time taken$ = \dfrac{{{\text{distance travelled}}}}{{{\text{speed}}}}$so, time when both the cars will meet=$\dfrac{{{\text{initial distance between both the cars}}}}{{{\text{relative speed between the cars}}}} = \dfrac{{\text{d}}}{{\text{r}}} = \dfrac{{160}}{{80}} = 2$ hours.after 8:10 am, both the cars which are initially at different places a and b will meet each other in the next 2 hours.therefore, time when they will meet each = 8:10 am + 2 hours = 10:10 amhence, option a is correct.note: in this particular problem, since the given two cars are moving in opposite directions (or moving towards each other) that’s why the individual speed of the cars are added in order to determine the relative speed between them but if they were moving in the same direction then the relative speed between these cars would have been obtained by subtracting the individual speed of these cars. hi there!we are asked to determine the reaction order of a and b using the given data.recall that the rate law only focuses on the reactant concentrations and has a general form of:rate= kaxbyk = rate constanta & b = reactantsx & y = reactant ordersreactant ain order to calculate the order of the reaction with respect to a, we must look for the experimental data where the concentration of a changes while the concentration of b remains the same.trial[a] (mol/l)[b] (mol/l)initial rate (m/s)10.1000.100520.3000.1004530.1000.2001040.3000.20090the rate laws are:rate= kaxbytrial 1:5 m/s= k0.100x0.100ytrial 2:45 m/s= k0.300x0.100ysolve for x using the ratio of the two rates:***the larger rate should be on the numeratorrate 2rate 1=45 m/s5 m/s= k0.300x0.100yk0.100x0.100y• for reactions at a constant temperature, the rate constant remains the same. thus, it could be canceled out.• since the reaction order ‘y’ of b is also the same, it could also be canceled out.45 m/s5 m/s= k0.300x0.100yk0.100x0.100y9 = 3xlog 9=x·log3log 9log3=x·log3log3x=2the reaction order, x, with respect to a is 2. reactant bin order to calculate the order of the reaction with respect to a, we must look for the experimental data where the concentration of b changes while the concentration of a remains the same.trial[a] (mol/l)[b] (mol/l)initial rate (m/s)10.1000.100520.3000.1004530.1000.2001040.3000.20090the rate laws are:rate= kaxbytrial 1:5 m/s= k0.100x0.100ytrial 3:10 m/s= k0.100x0.200ysolve for x using the ratio of the two rates:***the larger rate should be on the numeratorrate 3rate 1=10 m/s5 m/s= k0.100x0.200yk0.100x0.100y• for reactions at a constant temperature, the rate constant remains the same. thus, it could be canceled out.• since the reaction order ‘x’ of a is also the same, it could also be canceled out.10 m/s5 m/s= k0.100x0.200yk0.100x0.100y2 = 2ylog 2=y·log2log 2log2=y·log2log2y=1the reaction order, y, with respect to b is 1. answer: `1.00` (i) here current (i) = 1 a, resistance (r) = 300 ohm, time(t) = 1hwe know thatp = i2r = 12 x 300 = 300 we = p x t = 300 x 1 = 300 wh(ii) here current (i) = 2 a resistance(r) = 100 ohm, time (t) = 1hwe know thatp = i2r = 22 x 100 = 400 we = p x t = 400 x 1 = 400 whhence, in case (ii), the electrical energy consumed per hour is more. the ratio of present ages of raman and salman is 4 : 5. after 5 years the ratio of ages of salman and karan will be 5 : 4. what is the difference (in years) in present age of raman and karan?रमन और सलमान की वर्तमान आयु का अनुपात 4 : 5 है। 5 वर्ष बाद, सलमान और करन की आयु का अनुपात 5 : 4 होगा। रमन और करन की वर्तमान आयु (वर्षों में) में अंतर कितना है?&nbsp; hi,

lots of great explanations below, but i fear they might be difficult to truly conceptualize. 

let's start with a pie!

if there's a pie in front of us, that is the market. we'll call it 100 units of pie

we cut the pie in half - one piece (50 pie units) for you, and one piece (50 pie units) for me

scenario 1: we do nothing, we both have 50% market share.

scenario 2: i eat half my pie. my pie slice is now 25 units, yours is still 50 units. as a result, you have 67% of the market share and i have 33%. my "revenues" have fallen and my market share has fallen. your revenues haven't changed but you've gained market share

scenario 3: not only do i eat half my pie, but you also eat 20% of yours. still, i ate more, so even though your "revenues" are down, you've still gained market share.

scenario 4: we both get given more pie (yay). but, i get a whole other 50 units, and you only get 5 more. your "revenues" are up, but you've still lost market share!

i've created the below image for you to visualize this better (click on it to blow it up)...hope this helps! I'll assume you mean how much actual time would be served on a particular sentence... it starts with "good time credits" that are applied to the sentence calculator a the beginning of the sentence. An inmate can only lose that good time by having behavior issues or breaking numerous rules. In federal you get 15%, state prison ranges from 15-30% good time. The difference with the state is that they're also dealing with a parole system too that can release an offender having done only one-third of their sentence. generaloraverage rate is the change in the concentration of a compound over a period of time.the average rate the reactants and products in a reaction are equal when the coefficient for each is 1.the rate for the reactants are negative. this is because the reactants are being consumed in the reaction. the rate for the product c is positive because it is being produced in the reaction.for a reaction where the coefficients of the compounds are different, the rate is multiplied by the reciprocal of the coefficient.example: 2a + b → 3cthe given reaction is:3o2(g) → 2o3(g)­given the rate of o2 consumption is -2.17x10-5 mol/l∙snote that value is negative to indicate that it is decreasing as the reaction proceeds.rearranging the rate equation to give the reaction rate is terms of [o3]: be irritated and raise your concerns. working moms would have more help if men were given more benefits. it's great for everyone.