I drive 60 miles in 48 minutes and 10 miles at 35 miles per

I drive 60 miles in 48 minutes and 10 miles at 35 miles per hour. What is my average speed and what is my average acceleration?

To get average speed:
time = d/r = 10 mi/35 mph = 2/7 hrs
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Average speed = total distance/total time = (60 + 10)mi/((48/60)+(2/7)) hrs
= 70/1.0857 = 64.47 mph
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To get average acceleration:
64.47/1.0857 = 59.38 mi/hr^2