#### mathdad

##### Full Member

- Joined
- Apr 24, 2015

- Messages
- 716

Solution:

Round trip distance = D

Going rate = 40 mph

Returning rate = 30 mph

Going time = x

Returning time = 7 - x

40x = 30(7 - x)

My problem here is the TIME set up. I do not understand why x is the going time and (7 - x) the returning time. Is the solution provided dividing 7 into two parts? If so, what WORDS in the problem reveal this information?