Mathematics, 09.03.2020 07:31 Fireburntbudder
A train goes twice as fast downhill as it can go uphill, and 2/3 feet as fast uphill as it can go on level ground. If it goes 120 miles per hour downhill, how long will it take to travel 45 miles per flat
Answers: 3
,
. We are told than speed uphill is 
the speed on flat ground. Therefore the speed on level ground will be 
.
on level ground as:
so to obtain time to cover 45miles:
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