Two pipes A and B can fill a tank in 20 minutes and 40 minutes If both pipes are opened si...........

Quantitative Aptitude ( CCS) Pipes&cistern

Two pipes A and B can fill a tank in 20 minutes and 40 minutes.If both pipes are opened simultaneously , after how much time should B be closed so that the tank is full in 18 minutes ?

10 min

9 min

8 min

4min

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Explanation:

Answer - (4)
Explanation :
A fill the tank in 1 minute (20×2 = 40) = 2 units
B fill the tank in 1 minute (40×1 = 40) = 1units
For 18 min(A) = 18×2 = 36 units
Remaining = 40 – 36 = 4 units
Time for B be closed so that the tank is full in 18 minutes = 4/1 = 4 min