Multiple choice

A man can row a distance of y km upstream in 4 hours. Find his speed in still water. (I) The speed of current is 1.5 km/hr. (II) He covers a distance of 60 km downstream in 5 hours. (III) He covers the distance of y km downstream in 3 hours.

  1. Only I & II

  2. Only I & III

  3. All I, II & III

  4. Any two of them

  5. None of these
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Let still water speed = x, current speed = c. Upstream: (x-c)×4 = y. We need x. Statement I: c=1.5, but y unknown. Statement II: (x+c)×5=60, but c unknown. Statement III: (x+c)×3=y, relates y and x+c. No single pair suffices - you need all three to solve. Any two statements leave too many unknowns.

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