85 mi/h x 1 km/.621 mi x 60 min/1 h x 60 sec/1 min = 492,753 km/sec (490,000 km/sec if you address the concern of significant figures)
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Miles per hour x 1.467 = feet per second.
First, convert the hours to seconds:10 miles/hour x 1 hour/3600 seconds = .002777 miles/secondNext, convert the miles to feet:.002777 miles/second x 5280 feet/mile = 14.67 feet/second
To convert from miles per hour to miles per second, use this formula:mph x 0.0002778 = miles per second
Formula=miles 10 hrs=3.000000000seconds
1 mile per hour = 0.44704 meters per second.