Problem: a rectangular park 60 m long and 40 m wide has two concrete crossroads running in the middle of the park and rest of the park has been used as a lawn . the area of the lawn is 2109 sq . m . what is the width of the road ? 
Options: a ) 5 m , b ) 4 m , c ) 2 m , d ) 3 m , e ) 6 m
d