16 mph is the answer I found after doing the work
The answer is 17 because a right angle is 90 and you subtract 73 from it and get 17
1 meter = 1000 mm
so then 5 meters is just 5 * 1000 = 5000 mm.
-b +or- root (b^2 -4ac) / 2a
3+or- root 9+20/ 2
3+ or - root 29 /2
5.38516480713 + 3 = 8.385 / 2
x = 4.1925
or x = -1.1925
a=1
b=-3
c=-5