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Average speed = Total distance covered/elapsed total time

The S.I unit for average speed is m/s, which is same as velocity or speed.

In our way to school, we are facing so many traffics which affect our speed. Suppose we have covered S1 distance in t1 time, S2 distance in t2 time, S3 distance in t3 time and S4 distance in t4 time. So that the average speed would be:

Average speed = total distance/total time

= (S1 + S2 + S3 + S4)/(t1 + t2 + t3 + t4)

Distance in 6 hr = 100 x 6 = 600 miles

Distance in 4 hr = 120 x 4 = 480 miles

So, total distance = 600 + 480 = 1080 miles

Total time = 6 hr + 4 hr = 10 hr

Therefore, Average speed = 1080/10 = 108 miles per hr

Distance in 2 hr = 70x 2 = 140 miles

Distance in 0.5 hr = 80 x 0.5 = 40 miles

Distance in 4 hr = 100 x 4 = 400 miles

Total distance = 140 + 40 + 400 = 580 miles

Total time = 2 + 0.5 + 4 = 6.5 hr

Therefore, Average Speed = 580/6.5 = 89.2 miles per hr