Question 1105296
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<pre>
f + 270r = 46.80    (1)
f + 480r = 65.70    (2)

-------------------------Subtract eq(1) from eq(2):

    210r =  18.90  ====>  30r = {{{18.90/7}}} = $2.70 per 30 kilometers is the additional charge per 30 kilometers.


Then flat fee is f = 46.80 - 9*2.70 = 22.50 dollars.
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Solved.