A tyre has two punctures. The first puncture alone 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 constant rate, how long does it take both the punctures together to make it flat?
1 1/2 minutes
3 1/2 minutes
3 3/5 minutes
4 1/4 minutes
A cistern can be filled by a pipe in 15 hours. But due to a leak in the bottom the cistern is just full in 20 hours. When the cistern is full, the leak can empty it in:
60 hours
40 hours
45 hours
30 hours
A and B can together do a piece of work in 15 days. B alone can do it in 20 days. A alone can do it in
30 days
40 days
45 days
60 days
A can do a work in 15 days and B in 20 days. If they work on it together for 4 days, then the fraction of the work that is left is:
1/4
1/10
7/15
8/15
Two pipes A and B also can separately fill a cistern in 60 minutes and 75 minutes respectively. There is a third pipe at the bottom of the cistern to empty it. If all the three pipes are simultaneously opened, then the cistern is full in 50 minutes. In how much time can the third alone empty the cistern?
110 minutes
100 minutes
120 minutes
90 minutes
Rahul can do a piece of work in 20 days while Santhosh can do it in 12 days. Santhosh worked at it for 9 days and left. Rahul can finish the remaining work in
11 days
7 days
5 days
3 days
A can do a piece of work in 4 hours; B and C together can do it in 3 hours, while A and C together can do it in 2 hours. How long will B alone take to do it?
8 hours
10 hours
12 hours
24 hours
10 women can complete a work in 7 days and 10 children take 14 days to complete the work. How many days will 5 women and 10 children take to complete the work?
3
5
7
Cannot be determined
A can do a piece of work in 30 days while B can do it in 40 days. A and B working together can do it in
70 days
42 3/4 days
27 1/7 days
17 1/7 days
Two pipes can fill a tank in 10 hours and 15 hours respectively. Both together can fill it in:
12 1/2 hours
5 hours
6 hours
7 hours
