Syntel Company Numerical Ability Pipes and Cistern

4. A cistern can be filled in 9 hours but it takes 10 hours due to a leak in its bottom. If the cistern is full, then the time that the leak will take to empty it is:

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Syntel Other Question

The difference between the simple interest and compound interest for 2 years is Rs 25 if rate of interest is 5 % p.a. Then find the sum?
2.
There are 8 houses in a line and in each house only one boy lives with the conditions as given below:

Jack is not the neighbour Siman.
Harry is just next to the left of Larry.
There is at least one to the left of Larry.
Paul lives in one of the two houses in the middle.
Mike lives in between Paul and Larry.
If at least one lives to the right of Robert and Harry is not between Taud and Larry, then which one of the following statement is not correct ?

[A]. Robert is not at the left end.
[B]. Robert is in between Simon and Taud.
[C].
Taud is in between Paul and Jack.
[D]. There are three persons to the right of Paul.