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Multiple Choice Questions

A sailor can row a boat 8 km down stream and return back to the starting point in 1 hour 40 minutes ...........

Quantitative Aptitude (Phase-1) Boats and Streams

A sailor can row a boat 8 km down stream and return back to the starting point in 1 hour 40 minutes. If the speed of the stream is 2 km/hr, then the speed of the boat in still water is

5 km/hr

10 km/hr

15 km/hr

20 km/hr

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Explanation:

8/x+2)+(8/x-2)=100/60

16x/x^2-4 = 5/3

5x^2-48x-20=0

x=(50,-2)/5, x=10

Hence, option 2 is the correct answer.

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A sailor can row a boat 8 km down stream and return back to the starting point in 1 hour 40 minutes ...........

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