A takes twice as much time as B and thrice as much as c to complete a piece of work. They together complete the work in 1 day. in what time, will A alone complete the work. 

The speed of a train varies inversely with its length. A 200 meters long train runs at a speed of 60 km/hr. In how much time will a 500 meters long train cover 96 km?

A man walks a certain distance and rides back taking a total time of 37 minutes. He could walk both ways in 55 minutes. How long would he take to ride both ways?

A thief escapes from a police station at 8:00 a.m. on a cycle at a speed of 50 km/h. A policeman starts chasing the thief on a motorbike at 9:30 a.m. at the speed of 65 km/h. At what distance from the police station will the policeman catch up with the thief?

One third of a certain journey is covered at the speed of 40 km/hr, one fourth at the speed of 25 km/hr and the rest at the speed of 50 km/hr. what will be the average speed(in km/hr) for the whole journey?

A man starts from his house and travelling at 30 km/h, he reaches his office late by 10 minute, and travelling at 24 km/h, he reaches his office late by 18 minutes. The distance (in km) from his house to his office is:

Travelling at 60 km/h, a person reaches his destination in certain time. He covers 60% of his journey in 2/5^th of the time. At what speed (in km/h) should he travel to cover the remaining journey so that he reaches the destination right on time ?

If the ratio of speed of train, car and bus is 6:5:3 and bus cover a distance of 240 km. in 4 hours. What is the difference between speed of the train and car?