<PRE><B>Question 1026491</B>
The distance is x miles

the speed is M mph
the time it took is miles/miles per hour, and that is x/M
The speed he needed was two hours less than that, or (x/M)-2, or (x-2M)/M.  Those units are mph
The distance is unchanged, and its units are miles.
The speed needed is xM/(x-2M).ANSWER
Try an example.
480 miles, and he drove at 60 mph, taking 8 hours.  He needed to get there in 6 hours, so he needed to drive 80 mph.
Use the speed he went, 60 mph
480*60/(480-120)=480*60/360
This is (1/6)*480=80 mph
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