A policeman spotted a thief from a distance of 800 meters. The thief started running, and the policeman began chasing him at a speed of 25 km/h. The thief's speed was 20 km/h. How far did the thief run before being caught by the policeman?

A bus travels 57 part of its total journey at its usual speed. The remaining distance is covered by the bus at 14 of its usual speed. Due to reduced speed, it reaches its destination 180 minutes late. If the total distance is 280 km, what is the usual speed of the bus?

A train traveling at a speed of 45 km/h crosses a pole in 24 seconds. What is the length of the train?