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
None of these

Correct Answer: 35 hours

Explanation:

Suppose pipe A alone takes x hours to fill the tank.

Then, pipes B and C will take	x	and	x	hours respectively to fill the tank.
	2		4

∴	1	+	2	+	4	=	1
	x		x		x		5

⟹	7	=	1
	x		5

⟹ x = 35 hrs.

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