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The speed of light is = 3x10^8 m/sec. How long will it take to reach Pluto, 278,000,000,000 km away?

I don't understand how to set this problem?

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time=distance/speed

so would it be
3x10^8mi/1sec x 1000km/1m x 60sec/1 min x 60min/1hr x and then what??

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