Question : Mohan completed a certain journey by car. If he covered 30% of the distance at 90 km/hr, 45% of the distance at 135 km/hr, and the remaining distance at 75 km/hr. His average speed (in km/hr) for the entire journey is:

Question : A car moves at the speed of 108 km/hr after repairing and moves at the speed of 72 km/hr before repairing. It covers a distance of $x$ km in 3 hours after repair. How long will it take to cover a distance of $5x$ km before repairing?

Question : A bus travels for three hours at 60 km/hr, four hours at 50 km/hr, and the next five hours at 50 km/hr. Find its average speed.

Question : Aman decided to cover a distance of 12 km in 78 minutes. He decided to cover the initial two-thirds of the distance at 10 km/hr and the remaining at some different speed. Find the speed for the last one-third of the distance.

Question : A boy covers a certain distance between his house and school on a cycle. Riding at an average speed of 15 km/hr, he is late by 10 min. However, with an average speed of 20 km/hr, he reaches the school 5 min earlier. Find the distance between his house and school.