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
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
A, B and C can do a piece of work in 20, 30 and 60 days respectively. In how many days can A do the work if he is assisted by B and C on every third day?
12 days
15 days
16 days
18 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
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 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 can fill a cistern in 9 hours and 12 hours respectively. In how much time will they fill the cistern when opened together?
2 1/3
5
3 2/3
5 1/7
A and B can do a piece of work in 45 and 40 days respectively. They began to work together but A leaves after sometime and B finished the remaining work in 23 days. After how many days did A leave?
6 days
8 days
9 days
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
7
Cannot be determined
A tap can empty a tank in one hour . A second tap can empty it in 30 minutes. If both the taps operate simultaneously, how much time is needed to empty the tank?
20 minute
30 minute
40 minute
45 minute
