Two pipes can fill a tank Q If both the pipes are opened simultaneously after how much time should i...........

Quantitative Aptitude ( CCS) Pipes&cistern

Study the following graph carefully to answer the given questions
Time taken by pipes to fill tanks in minutes

Two pipes can fill a tank Q. If both the pipes are opened simultaneously, after how much time should inlet 2 be closed so that the tank is full in 12 minutes?

5 minutes

6 minutes

7 minutes

8 minutes

9 minutes

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Explanation:

Time taken to fill tank Q = 12 min
Work of inlet 1 = 1/15
Work of inlet 2 = 1/25
Inlet 1 works for 12 min and inlet 2 works for (12 – x ) min
12/15 + (12 – x )/25 = 1
12 – x = 5
x = 7
So, 12 – 7 = 5 minutes

Hence option 1 is correct.