Two places P and Q are 180 km apart. Two trains start from P and Q towards each other at the same time and meet after 4 hours. If the speed of one train is 13 km/h faster than the other, find the speed of both trains.

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.