Question 458479
(2x)2+(2x+18)2=(70.46)2
4x2+4x2+72x+324=4964.6116
8x2+72x-4640.6116=0
*[invoke quadratic "x", 8, 72, -4640.6116]
Throwing out the negative answer, we get the speed of the slower train to be 20.0015601544065 mph and the speed of the faster train to be 29.0015601544065 mph..