A tyre has two punctures. The first puncture alone would have made the tyre flat in 10 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 ?  Choose the correct option:
A) 3 1/5min
B) 3 2/5min
C) 3 3/5min
D) 3 3/4min
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 =   (1/10+1/6)=(8/30) = (4/15)   So both punctures will make the type flat in   (15/4)mins=3 3/4mins   Option 3 3/4min
<result>D</result>
A tyre has two punctures. The first puncture alone would have made the tyre flat in 10 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 ?