SSC CHSL Model Paper 2

Question : 64 of 100

Marks: +1, -0

A tank is filled in 5 hours by three pipes A, B and C. The pipe C is twice as fast as B and B is twice as fast as A. How much time will pipe A alone take to fill the tank?

20 hours
25 hours
35 hours
Cannot be determined

Validate

Solution:

Suppose pipe A alone takes x hours to fill the tank.
Then, pipes B and C will take

x/2

and

x/4

hours respectively to fill the tank.
⇒

1/x+2/x+4/x=1/5

⇒

7/x=1/5

⇒ x = 35 hours

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