TS ICET 23 May 2018 Shift 1 Paper

Question : 96 of 200

Marks: +1, -0

Three taps P. Q, R can separately fill a cistern in 6 min, 12 min and 15 min respectively. While a fourth tap S can empty the cistern in 4 min. If all the four taps are opened together when the cistern is empty, in what time (in minutes) the cistern is full?

Validate

Solution:

Let the empty tank be full in t minutes.

1/t=1/6+1/12+1/15-1/4

⇒1/t⇒{10+5+4-15}/60

i.e

=1/15

Hence t = 15 minutes

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