Multiple choice

The speed of a boat along the stream is 8 km/h and against the stream is 6 km/hr. The time taken by the boat to sail 28 km in still water is

  1. 2 hrs

  2. 3 hrs

  3. 4 hrs

  4. 8 hrs
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Speed in still water = (Downstream + Upstream) / 2 = (8 + 6) / 2 = 7 km/h. Time = Distance / Speed = 28 / 7 = 4 hours.

AI explanation

First, find the speed of the boat in still water by averaging the downstream and upstream speeds, which is (8 + 6) / 2 equals 7 km/hr. Then, apply the distance formula Time equals Distance divided by Speed to find the time to sail 28 km. This gives 28 / 7 equals 4 hours. The time taken by the boat to sail 28 km in still water is 4 hrs.

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