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?​

Answer 1

Solution :-

• Speed of boat in still water = 10km/h .
• Let speed of stream = x km/h .

then,

• Speed in downstream = (10 + x) km/h .
• speed in upstream = (10 - x) km/h .

Let us also assume that, distance between A to B is D km.

So,

→ Time in downstream = Time in upstream

→ Distance/Speed in downstream = Distance/Speed in upstream

→ D/(10 + x) = D/(10 - x)

→ 10 + x = 10 - x

→ x + x = 10 - 10

→ 2x = 0

which is not Possible .

Therefore, we can conclude that, with given data , the speed of the stream Cannot be determined .

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