Work-Time

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A and B can complete work together in 5 days. If A works at twice his speed and B at half of his speed, this work can be finished in 4 days. How many days would it take for A alone to complete the job?
10
yes
12
no
15
no
18
no
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Carpenter A can make a chair in 6 hours, carpenter B in 7 hours and carpenter C in 8 hours. If each carpenter works for 8 hours per day, how many chairs will be made in 21 days?
61
no
67
no
73
yes
79
no
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If 15 pumps of equal capacity can fill a tank in 7 days, then how many extra pumps will be required to fill the tank in 5 days?
6
no
7
no
14
no
21
yes
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A conveyor belt delivers baggage at the rate of 3 tons in 5 minutes, and a second conveyor belt delivers baggage at the rate of 1 ton in 2 minutes. How much time will it take to get 33 tons of baggage delivered, using both the conveyor belts?
25 minutes and 30 seconds
no
30 minutes
yes
35 minutes
no
40 minutes and 45 seconds
no
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If a quantity of food serves 80 soldiers for 17 days, then how many soldiers will it serve for 16 days?
85
yes
68
no
64
no
96
no
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7 men and 3 women can do twice as much work as done by 3 men and 7 women in the same time. What is the ratio of work done by a man and a woman in unit time?
1:11
no
11:1
yes
1:1
no
None of these
no
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X is 3 times as fast as Y and is able to complete the work in 40 days less than Y. Then the time in which they can complete the work together is.
15 days
yes
10 days
no
7 1/2 days
no
5 days
no
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A and B can complete a piece of work in 8 days, B and C can do it in 12 days, C and A can do it in 8 days. A, B and C together can complete it in.......
4 days
yes
5 days
no
6 days
no
7 days
no
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A can complete a work in ‘m’ days and B can complete it in ‘n’ days. How many days will it take to complete the work if both A and B work together?
(m+n) days
no
(1/m)X(1/n) days
no
(m+n)/mn
no
Mn/(m+n)
yes
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4 men and 5 women can do a piece of work in 10 days. 5 men and 4 women can do the same work in 8 days. 8 men and 8 women can do the work in.....
3 days
no
4 days
no
5 days
yes
6 days
no
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