A motorist travels a certain distance at an average speed of 48 km/h and returns the same distance at an average speed of 32 km/h. What is the average speed (in km/h) for the whole journey?

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.