65-70
The average speed of the train for the entire trip would be the harmonic mean of 60 mph and 40 mph. Using the formula for harmonic mean: 2 * 60 * 40 / (60 + 40) = 48 mph. So, the average speed of the train is 48 mph.
20 mph
55 mph on Amersham runs..... normally 15-20 mph on average underground
Around 95 mph.
Average speed is 50 mph [(40+60)/2].
The average speed of a male ejaculation is 28 mph!!!
Average speed is about 6 mph.
214 mph
Yes, it can.
The train's speed is 372.8 mph or about 600km/h
A house fly can fly at an average speed of about 4.5 mph.
202.5 mph