Question 884709
Previously Posted
{{{150km/(b + 30kph) + 50km/b = 5.5hr}}} |Multiplying thru by b(b+30) so as all denominators = 1
150b + 50(b+30) = 5.5b(b + 30)
5.5b^2 -35b -1500 = 0  (Tossing out the negative solution for unit measure)
b = 20kph and car is 50kph
 *[invoke quadratic "x", 5.5,-35,-1500]