Walking at three-fourths of his usual speed, a man covers a certain distance in 2 hours more than the time he takes to cover the same distance at his usual speed. Find the time taken by him to cover the distance at his usual speed.

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.