1) Two guns were fired from the same place at an interval of 13 minutes but a person in a train approaching the place hears the second report 12 minutes 30 seconds after the first. Find the speed of the train, supposing that sound travels 330 metres per second.

2) A person walks from A to B at the rate of 3 kmph and after transacting some business which occupies him an hour, returns to A by tramway at the rate of 5 kmph. He then finds that he has been absent for 2 hours 20 minutes. Find the distnace from A to B.

3) Mohan and Sohan working separately can dig a trench in 10 days and 12 days respectively. If they are working for 1 day alternately, Mohan beginning, in how many days will the trench be dug?

4) A is thrice as good a workman as B, and is therefore able to finish a piece of work in 60 days less than B. Find the time in which they can do it working together.

5) If 12 men and 16 boys can do a piece of work in 5 days and 13 men and 24 boys can do it in 4 days, compare the daily work done by a man with that done by a boy.

Which Of The Following Does Not Fit In The Series?
6) 2185, 727, 241, 79, 30, 7, 1

7) 5, 7, 13, 25, 45, 87, 117

8) 2, 1, 10, 19, 14, 7, 16

9) 2, 6, 24, 96, 285, 568, 567

10) 2, 3, 10, 15, 25, 35, 50, 63