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Average speed = Total distance/total time

The standard unit for average unit is m/s.

If the distance travelled by an object in time t1, t2, t3, t4 and t5 are S1, S2, S3, S4 and S5 respectively, then its average speed will be.

Average speed = (S1 + S2 + S3 + S4 + S5)/(t1 + t2 + t3 + t4 + t5)

Total distance = 0.50 miles + 0.4 miles = 0.9 miles

Total time = 30 min + 30 min = 60 min = 1 hr

Therefore, Average speed = total distance/total time

= 0.9/1 = 0.9 miles per hr

Distance travelled in first 2 hr = 40 x 2 = 80 miles

Distance travelled in remaining 4 hr = 18 x 4 = 72 miles

So that, total distance = 80 + 72 = 152 miles

Average speed = total distance/total time

= 152/6 = 25.33 miles per hr.