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A can do a piece of work in 25 days and B in 75 days. Working together, In how many days will they complete the work.
Ram can do a piece of work in 10 days andHari alone can do the sane work in 20 days. They started working together. In how many days will they complete the work.
A, B, and C can do a piece of work in 24 days. A and B can do it in 40 days, B and C can do it in 30 days. How many days will A and C take to finish work?
A and B can do a piece of work in 4 days, B and C in 6 days and A, B and C all together in 3 days, what time will A and C take to do it?
A and B can together finish a work 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 work?
(A + B)'s 20day's work
Remaining work
Now, work is done by A in 20 days
∴ The whole work will be done by A in (20×3) = 60days
A and B can do a work in 8 days B and C in 12 days, C and A in 16 days. All worked for 2 days. How many days willA take to finish the work.
Correct Answer : d
Explanation : A and B do (1/8)th of the work in a day.
B and C do (1/12)th of the work in a day.
A and C do (1/16)th of the work in a day.
2A, 2B and 2C do (1/8)+(1/12)+(1/16) = (18/144)+(12/144)+(9/144) = (39/144) or (13/48)th of the work in a day.
Or A, B and C do (13/96)th of the work in a day.
So A, B and C together will complete the whole work in 96/13
A can do a piece of work in 12 hours and with the help of his son, he is able to do it in 8 hours. How many hours will the son alone take to finish the work?
Correct Answer : b
Explanation : M can do 1/12 work in a day.
M and S altogether will do 1/8 work in a day.
Work of M in a day + Work of S in a day
1/M + 1/S = 1/8
1/12 + 1/S = 1/8
1/S = 1/8 – 1/12
1/S = 1/24
S = 24
That means S in one day can do 24 work
A pipe can fill a tank in y hours and another can empty it in x hours. They can together fill it in ………(x > y).
The correct option is C.
Part of the tank filled in 1 hour = 1/y
Part of the tank emptied in 1 hour = 1/x
Part of the tank filled in 1 hour when both are opened = 1/y  1/x hrs
A tank is filled by a pipeA in 32 min. and pipe B in 36 min. When filled, it can be emptied by pipe C in 20 minute. If all the three pipes are opened simultaneously 1/3^{rd} of tank will be filled in
Two pipes x and y can fill a cistern in 24 minute and 32 min. res. If both the pipes are opened together, then after how much time should ybe closed so that tank is full in 18 minutes.
Mahesh and Umesh can complete a work in 10 days and 15 days respectively. Umesh starts the work and after 5 days Mahesh also joins him. In all, the work would be completed in
Twelve men can complete a work in 8 days. Three days after they started the work, 3 more men joined them. In how many days will all of them together complete the remaining work:
The rates of working of A and B are in the ratio 3 : 4. The number of days taken by them, to finish the work are in the ratio:
Sunil completes a work in 4 days whereas Hrithik completes the work in 6 days. Ramesh work 1 ½ times as fast as Sunil. How many days it will take for the three together the complete the work?
A can do a piece of work in 10 days and B can do the same piece of work in 20 days. They start the work together but after 5 days, A leaves off. B will do the remaining piece of work in :
A and B can together finish a work in 30 days. They worked for it for 20 days and then B left. The remaining work done by A alone in 20 more days. A alone can finish the work in
A can complete a job in 9 days, B in 10 days and C in 15 days. B and C start the work and are forced to leave after 2 days. The time taken to complete the remaining work by A is
A, B and C together earn Rs. 150 per day while A & C together earn Rs. 94 and B and C together earn Rs. 76. The daily earning of C is:
A is twice as good a workman as B and together they finish a piece of work in 14 days. A alone can finish the work in
A is thrice as good as workman as B and takes 10 days less to do a piece of work than B takes. B can do the work in
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