Multiple choice

Two pipes can fill a tank in 20 and 30 min respectively. In how much time they both can fill the tank together?

  1. 12min

  2. 15 min

  3. 25 min

  4. 50 min

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

Part filled by A in 1min = 1/20 Part filled by B in 1min = 1/30 Part filled by (A+B) in 1 min = (1/20 + 1/30) = 1/12 = both pipes can fill the tank in 12 min.

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