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Math Help - light year conversion

  1. #1
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    light year conversion

    A ly (light year) is the distance that light travels in one year. The speed of light is 3.00 108 m/s. How many miles are there in a ly?
    (1 mi = 1609 m and 1 yr = 365.25 days)

    Here is what i do
    300,000,000 m/s X \frac{.1609mi}{1m} X \frac{1yr}{31,557,600s}=1.53 ly?

    please close have found solution
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  2. #2
    Senior Member Educated's Avatar
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    You have your fractions the wrong way around. And also 1609 meters should be kept the same.

    \text{miles} = 300000000 \times \frac{1}{1609} \times 3155760
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