Pipes A and B can fill a tank in 5 and 3 hrs respectively Pipe C can empty empty it in 15 h The tank...........

Quantitative Aptitude ( CCS) Pipes&cistern

Pipes A and B can fill a tank in 5 and 3 hrs respectively. Pipe C can empty empty it in 15 h. The tank is half full. All the three pipes are in operation simultaneously. After how much time the tank will be half full ?

1(7/15)hrs

2(1/11)hrs

1(1/14)hrs

2(3/11)hrs

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Explanation:

Answer & Explanation
Answer – 1(1/14)hrs
Explanation :
In 1 hr = 1/5+1/3 – 1/15 = 3+5-1/15 = 7/15
½ tank filled by 3 pipes = 15/7*1/2 = 15/14 =1(1/14)