A delivery drone travels 'X' km with the wind in 4 hours and (X - 20) km against the wind in 8 hours. If the speed of the wind is 5 km/h, then find the time taken by the drone to travel (X - 10) km in still air.

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.