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Multiple Choice Questions

A motorboat in still water travels at a speed of 36 kmph It goes 56 km upstream in 1 hour 45 minutes...........

Quantitative Aptitude(IBPS RRB PO) Boats and Streams

A motorboat in still water travels at a speed of 36 kmph. It goes 56 km upstream in 1 hour 45 minutes. The time taken by it to cover the same distance down the stream will be

2 hrs 25 min

3 hrs

1 hrs 24 min

2hrs 21 min

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Explanation:

Speed of motar boat in still water, x = 36 km/h
Speed of upstream, U = 56 km/(1 + 3/4) = 56 × 4/7 = 32 km/hr
According to the question,
x – y = U
36 – y = 32
y = 4 km/h
Speed of Downstream, D = x + y
= 36 + 4
= 40 km/h
Time taken to cover the distance downstream
= 56/40 h
1 hours 24 minutes

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