If light travels at 3 x 10^8 m/s. how fast is this in miles/hr?

Question

Can you explain how to do it?

Answer 1

about 7,680,000 mi/hr

Answer 2

3 x 10 ^8 m/s x 1 km/1000m x 0.621371192 mi/km x 60s/min x 60 min/hr = 6.710808874 x 10^8 mi/hr

In these equations, the units should all cancel out except for miles and hours.

Answer 3

670 616 629 mph

Answer 4

Multiply your value by 3600 (60 seconds in a minute, and 60 seconds in an hour).

Then divide that value by 1609.344 (number of meters in a mile (although usually 1600 is used)).

To figure out when to divide or multiply is simple.  You have m/s.  So to keep time on the bottom of the fraction and to convert from seconds to hours you multiply m/s x s/min x min/hr.  Thus the seconds unit cancels out and then the minutes unit cancels out and you now have meters/hour.  This strategy is useful for every unit conversion.

Answer 5

671,080,887.6 mph