At their annual car wash, the science club washes 30 cars in 45 minutes. At this rate, how many cars will they wash in 1 hour
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45 min spend for 30 cars
1 min spend for 30/40= 3/4 car
1hr =60 min spend for =3×60/4 = 3×15=45 cars
1 min spend for 30/40= 3/4 car
1hr =60 min spend for =3×60/4 = 3×15=45 cars
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