'A' and ' B ' can do a piece of work in 25 days and 30 days respectively. Both start the work together but 'A' leaves the work 8 days before its completion. Find the time in which the work is finished.

A person travels for 5 hours at the speed of 40 kmh"1 and for 6 hours at the speed of 50 kmh'1 . At the end of it, he finds that he has covered 1/2 of the total distance. At what average speed should he travel to cover the remaining distance in 10 hours ?

Wages for 40 women amount to Rs 15000 in 60 days. How many men must work for 15 days to receive Rs 6000? The daily wage of a man is double that of a woman.

A pipe can empty a tank in 15 hours and another can eirrtv ;t in 10 hours. If both the pipes are opened simui taneously, how long will it take to completely empty a full tank ?

A person lent a certain sum of money at 5% simple interest, and in 10 years the interest amounted to Rs 4500 less than the sum lent. Find the sum lent.

Aihiefgoes away in a car at a speed of 60 kmh"1. A cop starts chasing thethiefafterl5minutesinacarataspeedof80 kmh1 . V. ben will the cop overtake the thief from the start ?