Three pipe P Q and R can fill a tank in 12 minutes 18 minutes and 24 minutes respectively The pipe R...........

Quantitative Aptitude ( CCS) Pipes&cistern

Three pipe P, Q and R can fill a tank in 12 minutes, 18 minutes and 24 minutes respectively. The pipe R is closed 12 minutes before the tank is filled. In what time the tank is full?

8.(5/13) hrs

8.(4/13) hrs

7.(4/13) hrs

8.(6/13) hrs

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Explanation:

Answer & Explanation
Answer – b) 8.(4/13) hrs
Explanation :
Let T is the time taken by the pipes to fill the tank
(1/12 + 1/18 + 1/24)*(T – 12) + (1/12 + 1/18)*12 = 1
We will get T = 108/13 = 8.(4/13) hrs