SOLUTION: A boy walked over hills at 3 kilometers per hour and on flat roads at 4 kilometers per hour. He walked 18 kilometers in 5 hours. How much of his trip was over hills?

Question 593076: A boy walked over hills at 3 kilometers per hour and on flat roads at 4 kilometers per hour. He walked 18 kilometers in 5 hours. How much of his trip was over hills?
Answer by lwsshak3(11628) (Show Source): You can put this solution on YOUR website!
A boy walked over hills at 3 kilometers per hour and on flat roads at 4 kilometers per hour. He walked 18 kilometers in 5 hours. How much of his trip was over hills?
**
let x=distance walked over hills
18-x=distance walked over flat roads
travel time=distance/speed
..
x/3+(18-x)/4=5
LCD:12
4x+54-3x=60
x=6 km
ans:
distance walked over hills=6 km
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