Answer:
v mi/h + 30 mi/h or (v + 30) mi/h
Explanation:
John's speed: v mi/h
Mike's speed: 30 mi/h more than John's speed
Mike's speed: 30 mi/h more than v mi/h
Mike's speed: v mi/h + 30 mi/h
Mike's speed: (v + 30) mi/h
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