# The distance between the earth and the moon is about 384,000 km. calculate the time it takes for light to travel from the moon to earth?

But the answer is $\approx 1.28 s$
The speed of light ($c$) is constant everywhere, it is $299 \text{,"792","458 m"/"s=299","792.458km"/} s$
Therefore, it takes $\left(384 \text{,"000)/(299",} 792.458\right) \approx 1.28 s$ for the light to travel from the moon to earth.