A boat covers a distance of 48 km downstream in 3 hours and the same distance upstream in 6 hours. If the speed of the boat in still water is x km/h, and the speed of the stream is y km/h, find the time taken (in hours) by the boat to cover a distance of [5x + 3y] km in still water.

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.