Multiple choice

One pipe can fill a tank three time faster than another pipe does. If together the two pipes can fill the tank in 36 minutes, then the slower pipe alone will be able to fill the tank in

  1. 81 min

  2. 108 min

  3. 144 min

  4. 192 min
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Let the slower pipe alone fill the tank in x min. Then, faster pipe will fill it in x /3 min. 1/x + 3/x = 1/36 , 4/x = 1/36 , x = 144 min.

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