Multiple choice

A man rows upstream 36 km and downstream 48 km taking 6hours each time. The speed of the current is एक आदमी धारा के प्रतिकूल 36 किमी और धारा के अनुकूल 48 किमी प्रत्येक बार 6 घंटे लेता है। धारा की गति है

  1. 0.5 kmph 0.5 किमी/घंटा

  2. 2 kmph 2 किमी/घंटा

  3. 1 kmph 1 किमी/घंटा

  4. 1.5 kmph 1.5 किमी/घंटा

  5. None of these इनमें से कोई नहीं
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C Correct answer
Explanation

Let boat speed in still water be b kmph and current speed be c kmph. Upstream speed = b - c, downstream speed = b + c. Time = distance/speed, so 36/(b-c) = 6 and 48/(b+c) = 6. This gives b-c = 6 and b+c = 8. Solving: 2b = 14, so b = 7 kmph; 2c = 2, so c = 1 kmph. The current speed is 1 kmph.

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