There are 12 pipes attached to a tank. Some of them are fill pipes and some are drain pipes. Each of the fill pipes can fill the tank in 12 hours, while each of the drain pipes will take 24 hours to drain a full tank completely. If all the pipes are kept open when the tank was empty, it takes 2 hours for the tank to overflow. How many of these pipes are drain pipes

1.  6

2.  11

3.  4

4.  7

View Answer  
4
Correct Answer :

4


Explanation :
No Explanation available for this question

A bath can be filled by the cold water pipe in 10 min and by hot water pipe in 15 min (independently each). A person leaves the bathroom after turning on both pipes simultaneously and returns at the moments when the bath should be full. Finding, however, that the waste pipe has been open he now closes it. In 4 min more, bath is full. In what time would be the waste pipe empty it

1.  9 min

2.  12 min

3.  15 min

4.  14 min

View Answer  
4
Correct Answer :

15 min


Explanation :
No Explanation available for this question

The digging work of the DMRC on the Adohini-Andheriamore stretch requires Twenty-four men to complete the work in sixteen days. As a part of the task if DMRC were to hire Thirty-two women, they can complete the same work in twenty-four days. Sixteen men and sixteen women started working and worked for twelve days. Due to time bound schedule the work had to be completed in remaining 2 days, for which how many more men are to be employed

1.  48

2.  24

3.  36

4.  16

View Answer  
4
Correct Answer :

24


Explanation :
No Explanation available for this question

When Abhinav and Bipul are working alone, they can complete a piece of work in 25 days and 30 days respectively. On day 1, Bipul started the work and Abhinav joined B from day 3 on-wards. Find after how many days will the work be completed

1.  13

2.  11

3.  15

4.  16

View Answer  
4
Correct Answer :

15


Explanation :
No Explanation available for this question

In Nuts And Bolts factory, one machine produces only nuts at the rate of 100 nuts per minute and needs to be cleaned for 5 minutes after production of every 1000 nuts. Another machine produces only bolts at the rate of 75 bolts per minute and needs to cleaned for10 minutes after production of every 1500 bolts. If both the machines start production at the same time, what is the minimum duration required for producing 9000 pairs of nuts and bolts

1.  130 minutes

2.  135 minutes

3.  170 minutes

4.  180 minutes

View Answer  
4
Correct Answer :

170 minutes


Explanation :
No Explanation available for this question

Two workers A and B manufactured a batch of identical parts. A worked for 2 hours and B worked for 5 hours and they completed half the job. Then they worked together for another 3 hours and they had to do (1/20)th of the job. How many hours time does B take to complete the job, if he worked alone

1.  24

2.  12

3.  15

4.  30

View Answer  
4
Correct Answer :

15


Explanation :
No Explanation available for this question

A and B borrowed a tractor for 23 days. A ploughed 12 acres per day for a certain number of days and then Bused it to plough 15 acres per day for the remaining days. If they paid Rs 3,000 and Rs 2,000 respectively, for how many days did A use the tractor

1.  12

2.  15

3.  16

4.  18

View Answer  
4
Correct Answer :

15


Explanation :
No Explanation available for this question

A, B and C, can complete a piece of work individually in 15, 30 and 40 days respectively. They started the work together and the A and B let 2 days and 4 days before the completion of the work respectively. In how many days was the work completed

1.  

2.  12

3.  15

4.  

View Answer  
4
Correct Answer :


Explanation :
No Explanation available for this question

Pipes A and B can fill a tank in 12 min and 16 min respectively. Both are kept open for 'n' min and then B is closed and A fills the rest of the tank in 5 min. The time 'n' after which B was closed is:

1.  3 min

2.  2 min

3.  5 min

4.  4 min

View Answer  
4
Correct Answer :

4 min


Explanation :
No Explanation available for this 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 many hours will the son take to do the same job, if he worked alone on the job

1.  20

2.  60

3.  100

4.  120

View Answer  
4
Correct Answer :

120


Explanation :
No Explanation available for this question
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