SOLUTION: 90 cars passes through on the bridge per hour, at this rate how many cars will pass by in 40 minutes on the bridge?

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Question 548321: 90 cars passes through on the bridge per hour, at this rate how many cars will pass by in 40 minutes on the bridge?
Found 2 solutions by rfer, nyc_function:
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
90/60=x/40
60x=3600
x=3600/60
x=60 cars

Answer by nyc_function(2741) About Me  (Show Source):
You can put this solution on YOUR website!
Let c = cars

90/c = 60/40

60c = 3600

c = 3600/6

c = 600 cars

Done!