SOLUTION: He notices that at 10:45 a.m. they are passing a marker labeled 101, and at 11:00 a.m. the car reaches marker 119. what is the speed?

Question 264332: He notices that at 10:45 a.m. they are passing a marker labeled 101, and at 11:00 a.m. the car reaches marker 119. what is the speed?
Found 2 solutions by rfer, JBarnum:
Answer by rfer(16322) (Show Source): You can put this solution on YOUR website!
18*4=72 mph
Answer by JBarnum(2146) (Show Source): You can put this solution on YOUR website!
He notices that at 10:45 a.m. they are passing a marker labeled 101, and at 11:00 a.m. the car reaches marker 119. what is the speed?
since i had to figure out how this other guy got 18x4=72...i figure id explain why so people can actually understand how to solve this.
MILE markers from 101 to 119 means 18 miles in distance
Took them 15mins because 11:00am-10:45am=15mins
15 mins is 1/4th of 1hour
so 15(4)=1hr
so 18(4)=72miles
18miles/15mins => (18mi(4))/(15min(4))=>72mi/60mins=> 72mi/hr=> 72mph
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