Question

Light travels at 3.0 x 108 km/s. How far does light travel in 5 minutes?

A) 1.5 x 1010 km
B) 1.5 x 1011 km
C) 9.0 x 109 km
D) 9.0 x 1010 km

Answer 1

3.0 x 10^8 km/s is how far light travels.
3.0 x 10^8 km/s x 60s is how far light travels in a minute
3.0 x 10^8 x 60 x 5 is how far light travels in 5 minutes, and you should get D as your answer.

Answer 2

D)
`9*10^(10)` km.

Explanation:

Given : Light travels at
`3* 10^(8)` km/s.

To find : How far does light travel in 5 minutes.

Solution : We have given

Light travels in 1 second =
`3* 10^(8)` km.

1 minute = 60 second.

5 minute = 60* 5 = 300 second .

Light travels in 5 minute =
`300 * 3* 10^(8)` km.

Light travels in 5 minute =
`3*10^(2)* 3*10^(8)` km.

=
`9*10^(10)` km.

Therefore, D)
`9*10^(10)` km.