<PRE><B>Question 1052537</B>
Fiora starts riding her bike at 20 mph, then slows down to 12 mph. The whole trip of 70 miles takes her 4.5 hours. For what distance does she travel at 20 mph? 
----
d = r*t
--
t = hours at 20 mi/hr
---
20t + 12*(4.5 - t) = 70
8t = 16
t = 2 hours
---
d @ 20 mi/hr = 20*2 = 40 miles
-------------
40/20 + 30/12 = 4.5 hours
</PRE>