A driver covers the first part of a journey at 80 km/hr for 2 hours and the second part at 60 km/hr for 1.5 hours, and the third part is covered in 1 hour by a reduced speed. If the average speed for this entire journey is 66 km/hr, what is the speed of the driver for the third part of the journey?

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.