Multiple choice

If one pipe A can fill a tank in 10 minutes, then 5 pipes, each of 20% efficiency of A, can fill the tank in:

  1. 15

  2. 10

  3. 12

  4. 18

  5. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Pipe A fills 1 tank in 10 minutes, so its rate is 1/10 tank per minute. Each of the 5 pipes has 20% efficiency, meaning each fills at 1/50 tank per minute. Combined, their rate is 5 × (1/50) = 1/10 tank per minute, taking 10 minutes to fill the tank.

Keep practicing — related questions