Multiple choice

In one hour a boat travels 13 km along the stream and 7 km against the stream. The speed of the boat in still water (in km/hr) is-

  1. 3

  2. 8

  3. 10

  4. 6
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Speed of boat in still water = (downstream speed + upstream speed)/2 = (13 + 7)/2 = 10 km/hr. The speed of the stream would be (downstream - upstream)/2 = (13 - 7)/2 = 3 km/hr. This is the standard formula for problems involving boats and streams.

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