Multiple choice

A boat can move upstream at 25 kmph and downstream at 35 kmph, then the speed of the current is?

  1. 15 kmph

  2. 5 kmph

  3. 10 kmph

  4. 13 kmph
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Upstream speed (u-v) = 25, Downstream speed (u+v) = 35. Current speed v = (Downstream - Upstream) / 2 = (35 - 25) / 2 = 5 kmph.

AI explanation

Using the stream speed formula, which is half the difference between downstream and upstream speeds, we calculate (35-25)/2. This equals 10/2, giving a speed of the current of 5 kmph.

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