It depends on your average velocity.
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228 million km = 141.7 million miles
Distance = Rate * Timeor, algebraically manipulated,Rate = Distance/TimeRate = 228 miles/70 mph= 3.257 hours-------------------------which is,= a little over 3 hours and 15 minutes============================
141.672 miles an hour
228 minutes
Miles do not convert to hours. Miles are length and hours is time.