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

Answer 1

d = v t

60 t = 40 (t+1)

20 t = 40

t = 2
so
d = 60*2 = 120 miles
or
d = 40*3 = 120 miles

Answer 2

d=vt.