5. A person, who can walk down a hill at the rate of 9/2
km/hour and up the hill at the rate of 3 km/hr. He
ascends and comes down to his starting point in 5
hours. How far did he ascend?
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The distance will be same man either ascend and descend .
km X
km / h + 3 km / hr
X km 92 km / h + 3km / hr
=5 h r s
. . time = Distance / speed
.
Total total = Ascending
Time + Descending , time
= 2 X X
= 9 + 3 = 5
2 X 9 + X 3 = 5
2 x + 3 x
9 = 5
2 x + 3 x 9 = 5
5 X = 5 x 9 = x = 9 km
5 x = 5 × 9 = x = 9km
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