A boat goes 48 km upstream and 56 km downstream in 12 hours. It can go 60 km upstream and 42 km downstream in 13 hours. Find the speed of the boat in still water (in kmph).

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.