Tap P and Q fill the tank up to 2 3 The remaining tank will be filled by only P tap Find the time to...........

Quantitative Aptitude (CDS) Pipes&cistern

Tap P and Q fill the tank up to 2/3. The remaining tank will be filled by only P tap. Find the time to completely fill the tank. If P filled the tank completely in 15 hours and Q filed the tank completely in 12 hours?

75hours

85hours

80hours

85/9hours

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Explanation:

P and Q together fill the tank
T(1/15 + 1/12) =2/3
T(4+5) /60 =2/3
T=40/9 hours
Remaining tank 1/3 filled by P only
T1(1/15) =1/3
T1=5 hours
Total time=40/9 +5
=85/9 hours