A person can complete a journey in 10 hours. He covers the first one-third part of the journey at the rate of 28 km/h and the remaining distance at the rate of 84 km/h. What is the total distance of his 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.