The speed of light is $\displaystyle {3 x 10^8 }$ m/sec. How long does it take light to travel the $\displaystyle {149 x 10^9}$ m distance from the sun to the earth?
The speed of light is $\displaystyle {3 x 10^8 }$ m/sec. How long does it take light to travel the $\displaystyle {149 x 10^9}$ m distance from the sun to the earth?
speed is distance per unit time: $\displaystyle s=\frac{d}{t}$
Solving for t, we see that $\displaystyle t=\frac{d}{s}$
You know what s and d are; they are given to you in the problem.