<PRE><B>Question 507662</B>
you drive 200 miles in 3 hours before stopping for 30 minutes for lunch and gas. after lunch you travel 150 miles in an hour and a half. what was your average speed for the trip?
------
Average speed when driving 
= (total distance)/(total driving time) 
= (200+150)/(3+3/2)
= 350/4.5
= 77.78 mph
-----
Average speed overall:
= (200+150)/5
---
= 350/5 hrs = 70 mph
=============
Cheers,
Stan H.
======================</PRE>