15 vans can carry 75 quintals of vegetable in 40 mins. Let us find how long will 20 vans take to carry 100 quintals of vegetable.

A goods train 250m. long is running at a speed of 33km/hr. Another mail train 200m long and running at a speed of 60 km/hr. It is running in same direction on a different track and after meeting the goods train over passes it. Let us find how long will the mail train take to overpasses the goods train.

To reach father's office from home, it takes 2 hrs 27 min. but while teturning home, it takes 2 hrs. 57 min. Let me find how long it takes in total to go to father's office and back.

Working 5 hours a day, a work can be completed in 30 days. Let's find, how long it would take to complete the work, working 6 hours a day.

Ourselves 1. Debubabu built a new house. He will paint the windows of his house. Each window has two paoes. If he takes 2 hr 15 min to paint 1 window pane, let's find how long will be take to colour 2 windows.

Let a business-man have sold rice of 15 quintal , 19 quintal and 20 quintal in three consecutive months. Then how many quintal of rice had he sold per month as a average ?

20- men, decided to complete the repairing work, of a house in 30 days. But after 6 days 8 men feel sick. Let's find, how long they will take to complete the work.

12 men had provision of food for 20 days. Let's find if there are 40 men, how long will the proyision last?

I learnt to bind book in my school. I found that it takes 1 hr. 15 min to bind I book. Let me find how many hours and mins I would take to bind 7 books.

A body at a temperature of 50^(@) F is placed outdoors where the temperature is 100^(@) F. If the rate of change of the temperature of a body is proportional to the temperature differenece between the body and its surrounding medium. If after 5 min the temperature of the body is 60^(@) F, find (a) how long will take the body to reach a temperature of 75^(@) F and (b) the temperature of the body after 20 min.

25 farmers take 12 days to plough 15 bighas of land. Then let's find, how many bighas of land can be ploughed by 30 farmers in 16 days.