Multiple choice

A boat can row (13) km/h in still water. If the speed of the stream is (4) km/h, find the time taken by the boat to go (68) km downstream?

  1. $1.5 hr$
  2. $2 hr$
  3. $3.36 hr$
  4. $4 hr$
  5. $None of these$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Downstream speed = boat speed + stream speed = 13 + 4 = 17 km/h. Time = distance/speed = 68/17 = 4 hours. This is straightforward - the stream aids the boat, making it faster than in still water.

Keep practicing — related questions