Multiple choice

A boat goes $60$km downstream in $5$ hours and $24$km upstream in $3$ hours. Find the speed of the current.

  1. $10$ kmph
  2. $6$ kmph
  3. $4$ kmph
  4. $2$ kmph
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D Correct answer
Explanation

Downstream speed = 60/5 = 12 kmph. Upstream speed = 24/3 = 8 kmph. Speed of current = (Downstream - Upstream) / 2 = (12 - 8) / 2 = 2 kmph.

AI explanation

Using the basic speed formula, the downstream speed is 60 km divided by 5 hours, which is 12 kmph. The upstream speed is 24 km divided by 3 hours, which is 8 kmph. The speed of the stream is half the difference between the downstream and upstream speeds, giving (12 - 8) / 2 = 2 kmph. The result is 2 kmph.

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