Question 904999
r original speed
68/r -68/(r+6)   = 11/60 hr |Multiplying thru by r(r+6) so as all denominators = 1
 68*6 = (11/60)r(r+6)
11r^2 +66r - 60*68*6 = 0 (Tossing out the negative solution for unit measure)
 *[invoke quadratic "x", 11, 66, -24480]