The time taken to cover a certain distance decreases by 35 minutes when the speed is increased from 5 km/hr to 10 km/hr. What is the difference between the time taken when the same distance is covered at a speed of 30 km/hr and 15 km/hr?

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.