Vinod travelled from his home to his office at a speed of 20 km/h and walked back along the same route at a speed of 5 km/h. If the entire round trip took 4 hours, what is the distance between his office and his home?

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.