A tyre has two punctures. The first puncture alone would have made the tyre flat in 8 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) 3 1/5min  B) 3 2/5min  C) 3 3/7min  D) 3 4/5min  E) 3 min
Explanation:   Do not be confused, Take this question same as that of work done question's. Like work done by 1st puncture in 1 minute and by second in 1 minute.   Lets Solve it:   1 minute work done by both the punctures =   (1/8+1/6)=(7/24)   So both punctures will make the type flat in   (24/7)mins=3 3/7mins   Option 3 3/7min
<result>C</result>
A tyre has two punctures. The first puncture alone would have made the tyre flat in 8 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 ?