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MathematicsMathematics
21 January, 06:48

Joan and her brother justin left a hotel at the same time, driving in opposite direction at constant rates. After traveling for 4 hours, they were 480 miles apart. If justin drove 10 miles per hour faster than joan, how fast did joan drive.

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  1. 21 January, 07:02
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    Let justin's velocity is x and joan's is y

    x = y + 10

    4x + 4y = 480, x + y = 120 ... (y+10) + y = 120, 2y = 110, y = 55 mph

    x = 65 mph
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Home » Mathematics » Joan and her brother justin left a hotel at the same time, driving in opposite direction at constant rates. After traveling for 4 hours, they were 480 miles apart. If justin drove 10 miles per hour faster than joan, how fast did joan drive.
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