A train covers the first 20 km at a speed of 30 km/h, another 30 km at 45 km/h, and the last 15 km at x km/h. If the average speed for the entire journey is 32.5 km/h, then the value of x 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.