1) 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?

2)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.

3)A certain number of men can do a work in 60 days. If there were 8 men more it could be finished in 10 days less. How many men are there?

4) A gun is fired at a distance of 3.32 km away from Rohit. He hears the sound 10 seconds later. Find the speed of the sound.

5) A carriage driving in a fog passed a man who was walking at the rate of 3 km an hour in the same direction. He could see the carriage for 4 minutes and it was visible to him upto a distance of 100 m. What was the speed of the carriage?

6) –2, 4, 22, 58, 118, 208 , ?

7) 16, 17, 21, 30, 46, 71 , ?

8) 2, 7, 28, ?, 126, 215, 344

9) 49, 56, 64, ?, 81, 90, 100, 110

10) 1, 1.5, ?, 20.25, 121.5, 911.25, 8201.25