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1 mile/50 sec * 3600 sec/hr = 72 mph
3600 sec per hour, 60 sec per minute. 3600 x 2 + 60 x 20 = 8400
That's a true statement. What is the question ?
No. The value km/hr is a speed. The value km/sec/hour is acceleration (how many km/sec do you gain each hour).
23.35 miles per hour