250r 10

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see question below/////////////?

on a 570 mile trip Mary average 5 miles per hour fast for the last 240 miles than she did for the frist 330 miles/the entire trip took 10hrs. How fast did she travel for the first 330 miles

r = rate for first 330 miles
r + 5 = rate for next 240 since d = rt, then t = d/t
330/r + 240/(r+5) = 10
330(r+5)/r(r+5) + 240r/r(r+5) = 10
[330(r+5) + 240r] / [r(r+5)] = 10
330r + 1650 + 250r = 10(r^2 + 5r) and so on... solve for r.
gotta go, my dog is throwing his ball at me wanting to play!

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