Question 230781
time = distance / rate


(380 / r) + (380 / (r + 5)) = 8


dividing by 4 ___ (95 / r) + (95 / (r + 5)) = 2


multiplying by r(r+5) ___ 95r + 475 + 95r = 2r^2 + 10r


subtracting 190r+475 ___ 0 = 2r^2 - 180r - 475


use quadratic formula to find r