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A boat can travel 12.6 km upstream in 54 min. If the speed of the water current is 1/8th of the speed of the boat in still water, how much distance (in km) the boat can travel downstream in 35 min?

A) 9
B) 10.5
C) 9.5
D) 11.5
E) 12

Correct Answer:


B) 10.5

Description for Correct answer:
The speed of the boat in upstream

\( \frac{126}{54} \times 60 = 14 km/h \)

Let the speed of the boat in still water = x km/h

Speed of current = \( \frac{x}{8} \)

\( x - \frac{x}{8} = 14\)

7x = 14 x 8

x = 2 x 8 = 16 km/h

The speed of the boat in down stream

\( 18 \times \frac{35}{60} = 10.5 km\)

Part of solved IBPS Clerk-Prelims questions and answers : Exams >> Bank Exams >> IBPS Clerk-Prelims

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