A man swimming in a river flowing at 3km/hr, find that in a given time he can swim thrice as far downstream as he can swim upstream. What will be his speed in still water?

A 110 m long train takes 3 seconds to pass a pole. How long is the platform if the train passes it in 15 seconds?

A boy travels between point A and point B at a speed of 6 km/h and returns at a speed of 9 km/h. If the total time taken by him is 1 hour 15 min, the distance between A and B is:

A train crosses a pole in 12 second and a bridge of length 170 meter in 36 second. Then the speed of the train is?

A Police officer sees a chain snatcher and runs to catch her from a distance of 50 metres. When the Police officer starts chasing the chain snatcher from a distance of 50 metres, the chain snatcher is running @ 2 metres per second. At the same time the Police Officer is chasing the chain snatcher @ 4 metres per second.

Find the distance covered by the chain snatcher when the Police Officer shall be able to successfully catch her?

A sales agent travels a distance of 50 km in 2 hours and 30 minutes. How much faster, in kilometres per hour, on average, must he travel to make such a trip in 5/6 hours less time?

A thief is spotted by a policeman from a distance of 200 meters. The policeman starts chasing at a speed of 10 km/h while the thief is running at a speed of 8 km/h. After how much time (in minutes) will the thief be caught ?