Multiple choice

A boat can travel with a speed of 30 km/hr in still water. If the speed of the stream is 6 km/hr, find the time taken by the boat to go 108 km downstream.

  1. 2 hrs

  2. 5 hrs

  3. 3 hrs

  4. 4 hrs

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Speed of boat in still water = 30 km/hr, speed of stream = 6 km/hr. Downstream speed = 30 + 6 = 36 km/hr. Distance = 108 km. Time = Distance/Speed = 108/36 = 3 hours.