prompt: Emma traveled by car 280 miles in 2 hours 20 minutes. What was the average speed of the car in miles per hour?
messages.content: Emma traveled by car 280 miles in 2 hours 20 minutes. What was the average speed of the car in miles per hour?
messages.role: user
messages.content: We first convert the time of 4 hours 20 minutes in minutes 2 hours 20 minutes = 2 × 60 + 20 = 140 minutes
  Average speed S is given by distance / time. Hence S = 280 miles / 140 minutes = <<280/140=2>>2 mile / minute
  There are 60 minutes in an hour so the speed is 2*60=120 miles/hour
  #### 120
messages.role: assistant