Time And Work

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91 A and B can together finish a work in 30 days. They worked together for 20 days and then B left. After another 20 days, A finished the remaining work. In how many days A alone can finish the job?

A
40
B
50
C
54
D
60

92 A and B can do a piece of work in 40 days and 50 days, respectively. Both begin together but after a certain time, A leaves off. In this case B finishes the remaining work in 20 days. After how many days did A leave?

A
13 1/3days
B
14 1/3days
C
16 1/3days
D
18 1/3days

93 A and B can complete a work in 15 days and 10 days respectively. They started doing the work together but after 2 days B had to leave and A alone completed the remaining work. The whole work was completed in:

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

94 A mason can build a tank in 12 h. After working for 6 h, he took the help of a boy and finished the work in another 5 h. The time that the boy will take alone to complete the work is

A
30 h
B
45 h
C
60 h
D
64 h

95 A, B and C can do a piece of work in 18, 24 and 36 days, respectively. They work alternately, first day C, second day B and third day A, fourth day C and so on. How many days will be needed to complete the work like this way?

A
18
B
20
C
24
D
30

96 A takes twice as much time as B and C takes thrice as much time as B to finish a work. Working together, they can finish the work in 12 days. Find the number of days needed for A to do the work alone:

A
20
B
22
C
33
D
44

97 A takes twice the time taken by B and thrice the time taken by C to do a particular piece of work. Working together, they can complete the work in 2 days. Find the number of days taken by A, B and C respectively to complete the work alone:

A
12, 6 and 4
B
18, 9 and 6
C
24, 12 and 8
D
6, 3 and 2

98 4 men or 6 women or 10 children can paint a house in 5 days. The painting is given to a couple and their 5 sons. They finish the job in

A
6 1/11 days
B
5 5/11 days
C
7 3/11 days
D
5 1/11 days

99 3 women and 18 children together take 2 days to complete a piece of work. How many days will 9 children alone take to complete the piece of work, if 6 women alone can complete the piece of work in 3 days?

A
9
B
7
C
5
D
6

100 A contract is to be completed in 50 days and 105 men were set to work, each working 8 h a day. After 25 days, $$\frac{2}{5}$$th of the work is finished. How many additional men be employed, so that the work may be completed on time, each man now working 9 h a day ?

A
34
B
36
C
35
D
37