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?
Total time = 3/140+1.5/168+1.5/210=0.0375 hr Average speed = 6km/0.0375hr=160 km/hr
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?
Kiran rides her scooter 14 km at an average speed of 16 km per hour and again travels 16 km at an average speed of 14 km per hour. What is her average speed for the entire trip approximately?
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?
Naina and Eesha, track stars with superb hearing, ran as fast as they could to catch up to the ice cream truck in the next town over. They averaged 6 kms per hour, then rested to enjoy their ice cream. They averaged 4 kms per hour over the same distance on the way back. Not counting the time they rested, What was their average speed?
