1.

Two vessels P and Q contain 'a' litres of petrol and 'b' litres of kerosene respectively. 'c' litres of petrol and same quantity of kerosene is taken out and then transferred to Q and P respectively. This process is repeated several times. If after the first operation the quantity of petrol or kerosene in either of P and Q does not change. What is the value of 'c'?

Answer»

(A) `(ab)/((a-B))`
(B) `(2ab)/((a+b))`
(C) `(ab)/((a+b))`
(D) `(a/b)^2`

Answer :C


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