Final answer:
To convert miles per hour to light years per second, divide the speed in miles per hour by the number of seconds in a year, and then divide by the number of miles in a light-year.
Step-by-step explanation:
To convert miles per hour to light years per second, we need to first establish a conversion factor between the two units. One light-year is the distance that light travels in one year, which is approximately equal to 5.86 x 10^12 miles. So, to convert the speed from miles per hour to light years per second, we need to divide the speed in miles per hour by the number of seconds in a year, and then divide by the number of miles in a light-year.
For example, if we have a speed of 500 miles per hour, the conversion would be:
500 miles/hour * (1 hour/3600 seconds) * (1 light-year/5.86 x 10^12 miles) = 3.15 x 10^-9 light years/second