Multiple choice

A man rows a boat 3 hours downstream and 3 hours upstream. Find speed of the boat in still water, if he covers a total distance of 18 km.

  1. 2 km/hr.

  2. 3 km/hr.

  3. 4 km/hr.

  4. 4.5 km/hr.

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

Total distance = 18 km covered in 3 hours downstream + 3 hours upstream. Speed = distance/time = 18/6 = 3 km/hr. This average speed equals the speed in still water since the time spent going upstream and downstream is equal.

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