Andrew drove from $A$ to $B$ at $60$ miles per hour. Then he realized that he had forgotten something at $A$,

Andrew drove from $A$ to $B$ at $60$ miles per hour. Then he realized that he had forgotten something at $A$, and drove back at $80$ miles per hour. He then zipped back to $B$ at $90 \,\text{mph}$. What was his approximate average speed in miles per hour for the entire trip?

A. $65 \,\text{mph}$
B. $70 \,\text{mph}$
C. $74.5 \,\text{mph}$
D. $80 \,\text{mph}$
E. $85 \,\text{mph}$

OA C

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