Math

I was trying to answer a question with the formula of time= d/v
Q:"an asteroid is 7.98x10^8km from the sun;if the speed of light is 2.99x10^8m/s, how many minutes will it take light from the sun to reach the asteroid."

What I did in my calculator:
(7.98x10^8)/(2.99x10^8)

Resulted in (798/299) in faction or 2.668896321 in decimal.

Do I need to convert in to a x10^? Sign or my answer is good, just put 2.6min

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  1. no power of 10 is required.

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  2. You are ignoring the units.
    7.98x10^8km = 7.98x10^11 m
    2.99x10^8m/s = 4.98333.. x10^6 m/min , I divided by 60

    now we can divide them:
    7.98x10^11 ÷ 4.98333..x10^6
    = 1.601 x 10^5 minutes

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  3. Ouch - my BAAADDDD!

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