Multiple choice

A boat travels 20 kms upstream in 6 hrs and 18 kms downstream in 4 hrs. Find the speed of the boat in still water and the speed of the water current?

  1. 1/2 kmph

  2. 7/12 kmph

  3. 5 kmph

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Downstream: speed = 18/4 = 4.5 kmph (b + c). Upstream: speed = 20/6 = 10/3 ≈ 3.33 kmph (b - c). Adding: 2b = 4.5 + 10/3 = 27/6. Solving: c = 7/12 kmph. Option B gives the speed of water current.

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