Math (geometry)

Earth's diameter at the equator is about 7926 miles. A jet flies 550 miles per hour. How long would it take the jet to fly halfway around the equator?

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  1. the whole circumference is 7926π.
    half the way around is 3963π.
    since the plane goes 550 miles each hour, it will take

    3963π/550 = 22.6 hours

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