Multiple choice

The speed of a Boat along the stream is 12 km/hour and against the stream is 8 km/hour. The time taken by the boat to sail 24 km in still water is

  1. 2 hours

  2. 3 hours

  3. 2.4 hours

  4. 1.2 hours
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Speed in still water = (downstream speed + upstream speed)/2 = (12+8)/2 = 10 km/hour. Time = Distance/Speed = 24/10 = 2.4 hours. Option A (2 hours) would be at 12 km/h, B (3 hours) at 8 km/h (upstream speed).

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