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Doctors Medicines MCQs Q&A

  1. 24 kmph
  2. 36 kmph
  3. 42 kmph
  4. 48 kmph
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1 Answers

Option 3 : 42 kmph

Let his speed in still water be v kmph and the speed of the flow be u kmph

⇒ His speed while rowing upstream = v - u = 144/4 = 36 kmph

⇒ Time taken by him to row downstream = 4/(1 + 1/3) = 3 hours

⇒ His speed while rowing downstream = v + u = 144/3 = 48 kmph

⇒ v - u = 36 and v + u = 48

Adding both the equations

⇒ 2v = 84

⇒ v = 42 kmph
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