If the speed of a train is increased by 20%, its travel time between two stations reduces by 2 hours. If its speed is decreased by 20%, the travel time increases by 3 hours. What is the normal duration of travel (in hours)?

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.