Question 945280
Kristin is driving on the highway at 60 miles per hour. How long will it take Kristin to reach a rest area 90 miles away?
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distance = rate*time
or,
rate = d/t
To get miles per hour, you divide the miles by the hours.
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distance = rate*time
d = r*t
Going 60 mi/hr, you go 60 miles in an hour.  Is that not obvious?
Then, in another 1/2, you go another 30 miles.  1/2 the time, 1/2 the distance.
--> 90 miles in 1.5 hours
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t = d/r
t = 90 mi/60 mi/hr
t = 1.5 hours
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That's a lot to say about such a simple concept.