Question 1015582
How long does the trip take USUALLY?  t.
How long does trip take at the new speed limit?  t+1/2.

<pre>
Usual           r         t          100
New Limit      r-10      t+1/2       100
</pre>

RT=D travel rate rule.
Do you know what to do?



(1)  Form a system of equations
(2)  Solve the system for r and t.