Jaidev takes `2 1/5` minutes to walk across the school ground.Rahul takes 7/4 minutes to do the same.Who takes less time and by what fraction?

Saurabh takes 15 minutes to reach school from his house and Sachin takes one hour to reach school from house.Find the ratio of the time taken by Saurabh to the time tken by Sachin

There is a circular path around a sports field. Sonia takes 18 minutes to drive one round of the field, while Ravi takes 12 minutes for the same. Suppose they both start at the same point and at the same time, and go in the same direction. After how many minutes will they meet again at the starting point ?

Manas taken 10 minutes to reach Metro Station and takes 15 minutes to reach school from metro station. What fraction of an hour is spent by him to reach school.

A man has to walk a certain distance. He finds that if he walked 1/4 of a km an hour faster he will take 20 minutes less, but if he walks 1/2 km an hour slower he will take 52 minutes more. Find the distance and his rate of walking.

A first order reaction takes 69.3 minutes for 50 % completion. Calculate time required for half change of reaction.

A factory manufactures two types of screws, A and B. Each type of screw requires the use of two machines, an automatic and a hand operated. It takes 4 minutes on the automatic and 6 minutes on hand operated machines to manufacture a package of screws A, while it takes 6 minutes on automatic and 3 minutes on the hand operated machines to manufacture a package of screws B. Each machine is available for at the most 4 hours on any day. The manufacturer can sell a package of screws A at a profit of Rs 7 and screws B at a profit of Rs 10. Assuming that he can sell all the screws he manufactures, how many packages of each type should the factory owner produce in a day in order to maximise his profit? Determine the maximum profit