Dipu drove from his home to college at 60 miles per hour. Returning over the same route, there was a lot of traffic, and he was only able to drive to 40 miles per hour. If the return trip took 1 hour longer, how many miles did he drive each way?

suppose,  total distance x miles when Dipu drove from his home to college, 60 miles goes in 1 hour  1 mile goes in 1/60 hour x miles goes in x/60 hour Returning over the same route, at 40 mph speed, x miles goes in x/40 hour here. x/40 - x/60=1 or,3x-2x/120=1 or,x=120 so, he drove 120 miles each way