Basic maths. Speed = distance/time, there fore 780/12 = 65mph
100 miles / 4 hours = 25 miles per hour.
The average speed is 66.67 miles per hour.
900/2.5 = 360 miles per hour
This is an average speed of 26.3 miles per hour.
At an average 50 miles an hour, it would take 40 hours.
150 miles an hour
The train's average speed was 34.5 miles per hour.
Total = 28 miles in 4 hours, average speed = 7 miles per hour.
180 miles / 5 hours = 36 miles per hour (average)
20 miles per hour.
The average speed is 2050/5 = 410 miles per hour.
100 miles / 4 hours = 25 miles per hour.
If you drive at an average rate of 70 miles per hour then 931miles / 70miles / hour = 13.3 hours
average velocity = miles/hours = (100 + 30)/(2 + 1) = 130/3 ≈ 43.33 miles/hour
3.5 hours.
5 hours.
154 miles / 5.5 hours = 28 miles / hour