Question

Some persons hire a boat for 4 hours. The river
flows at a speed of 5 km/hr and the boat moves
with speed of 15 km/hr relative to the water. How
far along the flow direction, they can go if they have
to return in 4 hrs.
(A) 5 km
(B) 7.5 km
(C)80/3
(D) 15 km​

Answer 1

Answer:

Explanation: In this question it says that some person hire boat for 4 hours river flow with speed 5km/hr

How far the flow of direction go or return in 4 hour

Now solve your questions

Answer 2

Answer:

80/3

Explanation:

Let that distance is x km

x/(15 +5) + x/(15-5) = 4

x/20 + x/10 = 4

3x/20 = 4

then x = 80/3 km.

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