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Discussion :: Boats and Streams

  1. 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?

    2. A.

    40 minutes
    B.

    1 hour
    C.

    1 hr 15 min
    D.

    1 hr 30 min

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    Answer : Option C

    Explanation :

    Rate downstream =[\( \frac { 1 } {10 }*60]\)km/hr = 6 km/hr.

    Rate upstream = 2 km/hr.

    Speed in still water =\(\frac { 1 } { 2 }(6+2) \)km/hr = 4 km/hr

     Required time =\( [\frac {5 } { 2 }]\)hrs=1\( \frac { 1 } { 4 } \)hrs= 1hr 15min

     

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