Multiple choice

A boat goes 15 km upstream in 80 minutes. The speed of the stream is 5 km/hr the speed of boat in still water is-

  1. 16.25 km/hr.

  2. 16 km/hr.

  3. 15 km/hr.

  4. 17 km/hr.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Upstream speed = Distance/Time = 15/(80/60 hrs) = 15/(4/3) = 11.25 km/hr. Using Upstream speed = Boat speed - Stream speed: 11.25 = Boat speed - 5, so Boat speed = 16.25 km/hr.

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