Some question: A tyre has two punctures. The first puncture along would have made the tyre flat in 9 minutes and the second alone would have done it in 6 minutes. If air leaks out at a constant rate, how long does it take both the punctures together to make it flat?
Options:
(A) 1 12 minutes
(B) 3 12 minutes
(C) 3 35 minutes
(D) 4 14 minutes
(E) None of these
Some stream of consciousness:
1 minute's work of both the punctures = (19 + 16) = 518
So, both the punctures will make the tyre flat in 185 = 335 min. The answer: (C).