In a stream, point B is between points A and C and equidistant from them. A boat can go from A to B and back in 5 hr 15 min, and from A to C in 7 hr. How long will the boat take to go from C to A?

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.