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Average speed = Total distance covered/total time

The unit of average speed is same as speed or velocity that is m/s.

If S1, S2 and S3 distance covered in t1, t2 and t3 time respectively, then

Average speed = (S1 + S2 + S3)/(t1 + t2 + t3)

Total distance = 60 miles + 90 miles = 150 miles

Total time = 4 hr + 6 hr = 10 hr

Average speed = Total distance/total time

= 150/10 = 15 miles per hour

First distance = speed x time = 156.8 x 2 = 313.6 km

Second distance = 82.2 x 2 = 164.4 km

Total distance = 313.6 + 164.4 = 478 Km

Total time = 4 hr

Average speed = total distance/total time

= 478/4 = 119.5 Km/h

In other method we can calculate the average of the two average speed.

Average speed = (156.8 + 82.2)/2 = 119.5 Km/h