Light travels at a constant speed of 10792528488 107 billion km per hour. The speed of light in miles per hour is 6702 x 10 8 mileshr. You can easily calculate average speed having time and distance given in different units of lenght eg.
This means that speed of light is bigger unit than miles per minute.
3 speed of light to mileshour 20112465126163 mileshour. 1 c 6706166293844 mph. 1 metersecond is equal to 22369362920544 miles per hour or 33366416468926E-9 speed of light. Light travels somewhat slower when it is in something such as glass or water.