Question 438689
Remember the distance formula:  d=rt
where
d= distance
r= rate (or you might think of it as speed)
t= time
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Also remember that the units of measure will often help you figure our what goes where.
d = miles
r = miles/hr
t = hr
So, when you multiple r*t, the "hr" cancel and you end up with miles.
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The setup is:
d = 170 miles
r = 67.5 miles/hr
t = ??
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Plug in what you know.
170 miles = 67.5 miles/hr * t hrs
Divide both sides by 67.5 mi/hr
170/67.5 = t
t = 170/67.5
t = 2.5185182 hr
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Done.
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