Multiple choice

Ram can row a boat in still water at 10 kmph. He decides to go boating in a river. To row upstream he takes 2 hours and to row downstream he takes 1 ½ hours. Find the Speed of the river?

  1. 10/7 kmph

  2. 11/5 kmph

  3. 9/7 kmph

  4. 13/5 kmph

  5. 5/7 kmph
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A Correct answer
Explanation

Let stream speed be S. Downstream speed = 10+S, Upstream speed = 10-S. Distance = (10+S)*1.5 = (10-S)*2. 15 + 1.5S = 20 - 2S. 3.5S = 5. S = 5/3.5 = 10/7 kmph.

AI explanation

Equating the distances for upstream and downstream travel gives the equation (10 - x) * 2 = (10 + x) * 1.5, where x is the speed of the river. Solving this equation yields 20 - 2x = 15 + 1.5x, so 3.5x = 5, making the speed of the river 10/7 kmph.

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