It takes 5 days for a steamboat to travel from point A to point B along a river downstream. It takes 7 days to return upstream from B to A. Assuming all engine power and river flow speeds are constant, how many days will it take for a passive raft to drift from A to B using only the river current?

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.