Multiple choice

Speed of stream is 75\% less than the speed of boat in still water. Find the ratio of downstream and upstream speed.

  1. 5:2

  2. 3:2

  3. 5:3

  4. 7:4

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

If stream speed is 75% less than boat speed, let boat speed = 4x, then stream speed = x (since 75% of 4x is 3x, so x is 75% less). Downstream speed = 4x + x = 5x. Upstream speed = 4x - x = 3x. Ratio = 5x:3x = 5:3. The question asks for the ratio of downstream:upstream speed.