Revision

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

A alone can do a piece of work in 6 days and B alone in 8 days. A and B undertook to do it for Rs. 3200. With the help of C, they completed the work in 3 days. How much is to be paid to C?

• Rs.375

• Rs.400

• Rs.600

• Rs.800

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

P can complete a work in 12 days working 8 hours a day. Q can complete the same work in 8 days working 10 hours a day. If both P and Q work together, working 8 hours a day, in how many days can they complete the work?

• 60/11

• 61/11

• 71/11

• 72/11

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 cistern has two taps which fill it in 12 minutes and 15 minutes respectively. There is also a waste pipe in the cistern. When all the three pipes are opened, the empty cistern is full in 20 minutes. How long will the waste pipe take to empty the full cistern?

• 10 minutes

• 8 minutes

• 20 minutes

• 5 minutes

Pipes A and B can fill a tank in 10 hours each. A third pipe C empties the tank in 20 hours. If all the three pipes are opened simultaneously, in how much time will the tank be filled?

• 6 hr 30 min

• 6 hr 40 min

• 6 hr 20 min

• 4 hr 40 min

A pump can fill a tank with water in 2 hours. Because of a leak, it took 2 hours to fill the tank. The leak can drain all the water of the tank in:

• 4 1/3 hours

• .7 hours

• .8 hours

• 14 hours

Two taps can separately fill a cistern 10 minutes and 15 minutes respectively and when the waste pipe is open, they can together fill it in 18 minutes. The waste pipe can empty the full cistern in?

• 7

• 13

• 23

• 19

A and B, working together can finish a piece of work in 6 days, while A alone can do it in 9 days. How much time will B alone take to finish it?

• 18 days

• 8 days

• 51 days

• 26 days