'A' is twrice as fast as 'B' , and is therefore able to finish a work in 24 days less than 'B' . What is the time in which they can do it working together ?

A man rode out a certain distance by car at the speed of 45 kmh- 1 and walked back at the rate of 5 kmh1 . The whole journey took 10 hours. What distance did he ride ?

The speeds of two trains are in the ratio 2 : 3 . They are going in opposite directions along a parallel line. The first train takes 10 seconds and the second train takes 5 seconds to cross a pole. What is the time they will take to cross each other completely ?

A man can row 5 kmh-1 in still water. If the stream is flowing at the speed of 3 kmh-1, it takes him 15 hrs to row to a place and come back. What is the distance between the two places ?