Use dimensional analysis/unit analysis/factor label (all different terms for the same concept).
7 miles/second * 60 sec/min * 60 min/hour = 25200 miles/hour
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3,000 feet per second = 2,045.45 mph
44 feet per second = 30 mph
1 mph = 0.44704 meters per second.
Feet per second x 0.68 = mph
17,895.5 mph