Problem Solving MCQ Set 29

Question: Pipe A can fill a tank in 'a' hours. On account of a leak at the bottom of the tank it takes thrice as long to fill the tank. How long will the leak at the bottom of the tank take to empty a full tank, when pipe A is kept closed?

1. (3/2)a hours
2. (2/3)a
3. (4/3)a
4. (3/4)a

Question: A and B working together can finish a job in T days. If A works alone and completes the job, he will take T + 5 days. If B works alone and completes the same job, he will take T + 45 days. What is T?

1. 25
2. 60
3. 15
4. None of these

Question: A man can do a piece of work in 60 hours. If he takes his son with him and both work together then the work is finished in 40 hours. How long will the son take to do the same job, if he worked alone on the job?

1. 20 hours
2. 120 hours
3. 24 hours
4. None of these

Question: A, B and C can do a work in 5 days, 10 days and 15 days respectively. They started together to do the work but after 2 days A and B left. C did the remaining work (in days)

1. 1
2. 3
3. 5
4. 4

Question: X alone can do a piece of work in 15 days and Y alone can do it in 10 days. X and Y undertook to do it for Rs. 720. With the help of Z they finished it in 5 days. How much is paid to Z?

1. Rs. 360
2. Rs. 120
3. Rs. 240
4. Rs. 300

Question: Ram starts working on a job and works on it for 12 days and completes 40% of the work. To help him complete the work, he employs Ravi and together they work for another 12 days and the work gets completed. How much more efficient is Ram than Ravi?

1. 50%
2. 200%
3. 60%
4. 100%