Multiple Choice Questions on A boatman goes 2 km against the current of the stream in 1 hour and goes 1 km along the current in 1........... for Civil Services Exam (CSAT) Preparation

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Multiple Choice Questions

A boatman goes 2 km against the current of the stream in 1 hour and goes 1 km along the current in 1...........

Math and Mental Ability Boats and Streams
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    A boatman goes 2 km against the current of the stream in 1 hour and goes 1 km along the current in 10 minutes. How long will it take to go 5 km in stationary water?

    40 min

    Incorrect Answer

    1 hr

    Incorrect Answer

    1 hr 15 sec.

    Correct Answer

    1 hr 30 min

    Incorrect Answer
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    Explanation:
    Rate downstream = 1 x 60 km/hr = 6 km/hr.
    10

    Rate upstream = 2 km/hr.

    Speed in still water = 1 (6 + 2) km/hr = 4 km/hr.
    2
     Required time = 5 hrs = 1 1 hrs = 1 hr 15 min.
    4 4

    Hence, option 3 is the correct answer.

    By: Amit Kumar
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