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 . if the area of the lawn is 2109 sq . m , then what is the width of the road ? 
Options: ['a ) 2', 'b ) 3.5', 'c ) 3', 'd ) 4', 'e ) 5']
c