# 3 inlet pipes a,band c can fill the tank in 12 hours. All pipes are open together,after 4 hours pipe c is closed. The rest tank fill by the pipea and b in 14 hours. How much time c take to fill the tank?

Asked By Amit On 08/12/2019 11:32

## Answers

Solution:
A, B, C together can fill a tank in 12 hours: 1/a + 1/b + 1/c = 1/ 12
All these pipes are open for only 4 hours and then C is closed: 4 (1/12) = 4/12 = 1/3
Remaining part: 1 - 1/3 = 2/3
This remaining part of 2/3 is filled by pipes A and B in 14 hours: (2/3) / 14 = 1/21
1/6 - 1/21 = 1 / (42/5)
C alone can fill the tank in 42/5 or 8.4 hours.

Answered On 08/13/2019 08:42

Answered On 08/13/2019 08:42

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