Asked by Shari

A train goes twice as fast downhill as it can go uphill, and 2/3 as fast uphill as it can go on level ground. If it goes 120 mph downhill, how long will it take to travel 45 miles on flat land?

Answers

Answered by bobpursley
speed uphill=120/2=60
speed level=3/2 * uphill=90
speed downhill=120

on flat land, d=45=90*t
t=1/2 hr
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