How Much Time Taken By Them to Fill The Tank ? If

A pipe can fill a tank in x hours and another can empty it in y hours. They can together fill it in (y>x)

  1. xy
  2. y – x
  3. xy/(y – x)
  4. x – y
Anurag Mishra Professor Asked on 12th August 2015 in Maths.
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1 Answer(s)
Best answer

Answer: (3) xy/(y – x)

Explanation: –
A pipe can fill a tank in = x hours
A pipe can fill a tank in a hour = 1/ x

Another pipe can empty it = y hours
Another can empty in a hour = 1 / y

They can together fill it in a hour = 1/x – 1/y
= (y – x)/xy

Therefore, They can fill it = xy / (x – y)

Hence, the answer is (3) xy / (y – x).

Anurag Mishra Professor Answered on 12th August 2015.
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