Question

The speed of a Boat in standing water is 10km/hr. It traveled Down Stream from point A to B in certain time. After reaching B the Boat is powered by Engine then Boat started to return from Point B to A. The time taken for Forward journey and Backward journey are same. Then what is the speed of the stream​

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The speed of boat in still water is 10 km per hr. If the boat goes 37.5 km upstream in 5 hours, find the speed of the stream.

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ANSWER

Solution:

Given Equation: Speed of boat in still water =10 km\hr

Boat Travels a distance of 37.5 km in time 5 hr.

Factor to consider speed of stream be 's'

According to the formula:

Speed =

Time

Distance

Total speed = speed of boat in still water and speed of stream

Since the boat travels upstream

Total speed = Speed of boat in still water - speed of water in stream

10−s=

5

37.5

10−s=7

2

1

s=2.5 km\hr