A train of length (150 + 10x) meters crosses a man walking at 6 km/hr in the same direction in 15 seconds. If the speed of the train is (54 + 2x) km/hr, find the value of x.

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.