Time And Work

Q1. 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. 1/4
2. 1/10
3. 7/15
4. 8/15

Q2. 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?

1. 12 days
2. 15 days
3. 16 days
4. 18 days

Q3. 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?

1. 375
2. 400
3. 600
4. 800

Q4. If 6 men and 8 boys can do a piece of work in 10 days while 26 men and 48 boys can do the same in 2 days, the time taken by 15 men and 20 boys in doing the same type of work will be:

1. 4 days
2. 5 days
3. 6 days
4. 7 days

Q5. 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?

1. 8 hours
2. 10 hours
3. 12 hours
4. 24 hours

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