A boat covers a distance from A to B downstream and returns from B to A upstream in a total of 4 hours. If the speed of the stream is 2 km/hr and the speed of the boat in still water is 4 km/hr, then the distance between A and B is:

Ramesh covers 56 part of the total distance by bus and the remaining 36 km by car. What is the total distance of his journey?

A person covers a distance of L km in 12 hours. If he increases his speed by 10 m/s, he covers the same distance in 8 hours. Which of the following statements is/are correct? I. The value of L is 760 km. II. The original speed of the person is 72 km/h.