0.66... recurring miles per minute.
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average speed = total_distance/total_time = (80 km + 100 km)/(10 min + 20 min) = 180 km/30 min = 6 km/min 1 hr = 60 min → 6 km/min = 6 × 60 km/h = 360 km/h
Average speed = Distance/Time = 2.5 miles/15 minutes = 10 miles per hour
depends on your speed... It depends on how fast you drive. If you average 51.8 miles per hour it will take 10 hours.
Average speed is total distance divided by total time. Hence 10 metres in 6 seconds is an average speed of (10/6) = 2.66666 m/s. Notice the units of speed - if you ever forget that speed is distance over time, just remember speed's units is something like metres per second, miles per hour etc. "per" means divided by.
Shane's mother's average speed is 6.7 MPH. 10 miles/ 90 minutes = 1/9 miles/minute 60 minute/hour 1/9 miles/minute x 60 minutes/hour = 6 2/3 miles/hours 6.7 mph