Multiple choice

(\text{The speed of a boat in still water is 10 km./hr. If it covers upstream a distance of 45 km. in 6 hours. The speed (in km./hr.) of the stream is -} )

  1. 2.5

  2. 3

  3. 3.5

  4. 4
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A Correct answer
Explanation

Speed upstream = distance/time = 45/6 = 7.5 km/hr. Let stream speed = s. Upstream speed = boat speed - stream speed, so 10 - s = 7.5, giving s = 2.5 km/hr.

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