Time And Work

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11 A certain number of men can do a piece of work in 80 days. If there were 10 men less, It could be finished in 20 days more. How many men are there in the starting?

A
45
B
50
C
40
D
60

12 A and B can do a work in 15 days, B and C in 20 days, C and A in 12 days. In how many days can they complete it if they work together:

A
15 days
B
10 days
C
18 days
D
12 days

13 If 12 men or 18 women can do a piece of work in 14 days. How long will 8 men and 16 women take to finish the work?

A
9 days
B
12 days
C
13 days
D
10 days

14 A certain number of men can do a work in 60 days. If there were 8 men more it could have finished in 10 days less. How many men were there?

A
30
B
40
C
58
D
62

15 If 5 men can do a work in 2 days and 3 boys can do the same work in 5 days, then find the time taken to complete same work by 10 men and 3 boys:

A
$$\frac{5}{6}{\text{ days}}$$
B
$$\frac{7}{6}{\text{ days}}$$
C
$$\frac{6}{7}{\text{ days}}$$
D
$$\frac{6}{5}{\text{ days}}$$

16 If 3 men or 5 women can reap a field in 43 days, how long will 5 men and 6 women take to reap it?

A
10 days
B
12 days
C
15 days
D
18 days

17 P and Q complete a certain work in 30 days, Q and R in 40 days while R and P in 60 days. How long will they take to finish it together?

A
$$\frac{40}{3}{\text{ days}}$$
B
$$\frac{8}{3}{\text{ days}}$$
C
$$\frac{16}{3}{\text{ days}}$$
D
$$\frac{20}{3}{\text{ days}}$$

18 A and B can do a piece of work in 60 days and 75 days, respectively. Both begin together but after a certain time A leaves off. In such case B finishes the remaining work in 30 days. After how many days did A leave?

A
25 days
B
21 days
C
20 days
D
24 days

19 40 men can build a wall 200 m long in 12 days, working 8 h a day. What will be the number of days that 30 men will take to build a similar wall 300 m long, working 6 h per day

A
32
B
18
C
36
D
9

20 20 workers working for 5 h per day complete a work in 10 days. If 25 workers are employed to work 10 h per day, what is the time required to complete the work?

A
4 days
B
5 days
C
6 days
D
8 days