Question 991991
.
To average 50mph for 4 hours he drove:
.
(50mph)(4hrs)=200 miles
. 
During 2 hours at 60mph:
(60mph)((2hrs)=120 miles
.
During the last 2 hours he drove:
200 mi-120 mi=80 mi
.
His average speed was:
80mi/2hr=40mi/hr
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ANSWER: His average speed the last 2 hours was 40 miles per hour.