How long does it take a beam of light to reach Earth from the Sun when the Sun is 93,000,000 miles from Earth? Express your answer in seconds, using scientific notation.

1. I know there are 5,280 feet in one mile.

2. The distance given is 93,000,000 miles. Must I use

the distance formula D = rt. If so, is t for time in hours?

3. Must I convert 93,000,000 to scientific notation as a first step?