Multiple choice

Meenu was asked to fill a tank which was already two third filled. She later used two inlet pipes which can fill the tank alone in 3 hours and 5 hours respectively. How long will it take to fill the rest of the tank if both inlet pipes are opened simultaneously?

  1. $\(\frac{3}{4}\) hours$
  2. $\(\frac{2}{3}\) hours$
  3. $1 hours$
  4. $\(\frac{5}{8}\) hours$

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

Tank is 2/3 filled, so only 1/3 remains empty. Combined rate of both pipes = 1/3 + 1/5 = 8/15 tank per hour. Time to fill remaining 1/3 = (1/3) ÷ (8/15) = 5/8 hours.

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