Question

The function d(t)= 300,000t represents the distance (in kilometers) that light travels t seconds How long does it take light to travel 12 million kilometers?

Answer 1

The function for the distance travelled is d(t) = 300,000t.

Determine the time taken by light to travel 12 million km.

`\begin{gathered} 12000000=300000\cdot t \\ t=(12000000)/(300000) \\ =(120)/(3) \\ =40 \end{gathered}`

So light takes 40 seconds to travell 12 million km.

Answer: 40 seconds