It takes 1.25 seconds to for light to travel from the moon to the earth how many miles away is the

Well,

If we approximate the speed of light as 300,000,000 m/s, then we just have to multiply 300,000,000 by 1.25.

300,000,000 * 1.25 = 375,000,000 meters

I would put it in scientific notation.
3.75 * 10^8 meters

If you want it in miles, then we can approximate the speed of light as 186,000 m/s.  Just do the same thing.
186,000 * 1.25 = 232,500 miles

Scientific notation: 2.325 * 10^5