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Maria normally spends a half-hour driving to work. When her average speed is ten miles per hour slower than usual, the trip takes ten minutes longer. How many miles does she drive to work?

  • math -

    s*(1/2) = (s-10)(1/2 + 1/6)
    s = 40

    40mi/hr * 1/2 hr = 20 mi
    30mi/hr * 2/3 hr = 20 mi

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