Verified Answer :

naǫ

\(\frac{22 \frac{1}{2} \ mi}{ \frac{1}{3} \ h}=\frac{\frac{45}{2} \ mi}{\frac{1}{3} \ h}=\frac{45}{2} \times 3 \ \frac{mi}{h}=\frac{135}{2} \ \frac{mi}{h}=\boxed{67 \frac{1}{2} \ \frac{mi}{h}}\)

His average speed is 67.5 mph.

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