Bronson roared off on his motorcycle at 60 mph Then much to

Bronson roared off on his motorcycle at 60 mph. Then, much to his chagrin, he ran out of petrol. He pushed the motorcycle all the way back at 3 mph. If the entire trip took 21 hours, how far did he push the motorcycle?

60X=3(21-X)
60X=63-3X
60X+3X=63
63X=63X=63/63
X=1 ANS. MILE IS THE DISTANCE TRAVELS @ 60 MPH & 3 MPH.
PROOF:
60*1=3(21-1)
60=3*20
60=60