Posted by Ronaldo on Tuesday, January 25, 2011 at 9:43pm.
D = RT (Distance = Rate x Time)
Normal Rate
R = rate
T = time
RT = 200
Increased Rate/less time
R + 10
T - 1
(R + 10)(T - 1) = 200
Solve these two equation simultaneously.
(R + 10)(T - 1) = 200
RT = 200
Expand the first equation and substitute RT = 200, for RT in that expansion.
Then solve for R and T (quadratic equation).
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