Multiple choice

A boat travels a distance of 24 km downstream in 4 hours and it takes 6 hours to cover the same distance against the stream. What is the speed of the current?

  1. 5 km/hr.

  2. 2 km/hr.

  3. 1 km/hr.

  4. 1.5 km/hr.

  5. 5.5 km/hr.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Let boat speed = b, current speed = c. Downstream: 24/(b+c) = 4, so b+c = 6 km/h. Upstream: 24/(b-c) = 6, so b-c = 4 km/h. Adding: 2b = 10, b = 5. Subtracting: 2c = 2, so c = 1 km/h. Option C is correct.

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