On a journey, across Bangalore, a cab averages 12 kmph for 60% of the distance, 15 kmph for 20% of it and 30 kmph for the remainder. What is the average speed for the whole journey?
14.3 km/h . The last part is 20% of the trip. Let's suppose the trip is 100 km. Travel time = 60/12 + 20/15 + 20/30 = 7 hours 100 km in 7 hours = 14.3 km/h
A cyclist covers his outward journey at 15 mph.
The return, over exactly the same distance, is uphill. He completes it at 5 mph.
What is the cyclist's average speed over the entire journey?
An aeroplane covers its outward journey at 600 kmph.
It returns, over exactly the same distance, at 400 kmph.
What is the average speed of the aeroplane over the entire journey?
A car covers its outward journey at 66 mph.
It returns, over exactly the same distance, at 33 mph.
What is the car's average speed over the entire journey?
A racing driver drove around a 6 km track at 140 km/hr for 3 km, 168 km/hr for 1.5 km and 210 km/hr for 1.5 km. What was his average speed for the entire 6 km?
An aeroplane maintains an average speed of 180 miles per hour from one airport to another airport. It then returns to the first airport over exactly the same distance at an average speed of 144 miles per hour. What was the average speed over the whole journey?
