Multiple choice

A boat travels 32 km downstream in 4 hours and 24 km upstream in 6 hours. What is the speed (in km/hr) of the boat in still water?

  1. 2

  2. 4

  3. 6

  4. 8
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Downstream speed = 32/4 = 8 km/hr. Upstream speed = 24/6 = 4 km/hr. Boat speed = (Downstream + Upstream) / 2 = (8+4)/2 = 6 km/hr.

AI explanation

Using the basic formula speed equals distance divided by time, the downstream speed is 32 divided by 4, which is 8 km/hr, and the upstream speed is 24 divided by 6, which is 4 km/hr. The speed of the boat in still water is the average of these two speeds: (8 plus 4) divided by 2. This gives 12 divided by 2, resulting in a still water speed of 6 km/hr.

Keep practicing — related questions