Asked by Anonymous

Leah biked down a 12-km mountain road four times as fast as she peddled up the road. If Leah made the round trip up and down the road in 1 hour and 15 minutes, what was her average speed riding downhill?
Answered by Reiny
rate uphill ---- x km/h
rate downhill ---- 4x km/h

12/x + 12/(4x) = 5/4
multiply each term by 4x
48 + 12 = 5x

continue ....
Answered by Steve
no wonder she rode faster going down, since she didn't have to stop to peddle her wares on the way...
Answered by Anonymous
I got x=12. So 12 times 4 equals 48. So she was going 48 km/h downhill. I have a question where did you get the 5/4 from
Answered by Reiny
umhh,
1 hour and 15 minutes
= 1 hour + 1/4 hour
= 5/4 hours
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