SOLUTION: A commuter train travels a distance of 4 miles in exactly 3 minutes. What is the average speed of the train in miles per hour?

Question 253626: A commuter train travels a distance of 4 miles in exactly 3 minutes. What is the average speed of the train in miles per hour?
Found 3 solutions by checkley77, stanbon, drk:
Answer by checkley77(12844)   (Show Source): You can put this solution on YOUR website!
D=RT
R=D/T
R=4/(3/60)
R=4/.05
R=80 MPH. IS THE SPEED.
Answer by stanbon(75887)   (Show Source): You can put this solution on YOUR website!
A communter train travels a distance of 4 miles in exactly 3 minutes. What is the average speed of the train in miles per hour?
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[4 mi/3 min][60 min/1 hr] = (4*60)/(3*1) (mi/hr)
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= (4*20) (mi/hr)
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= 120 mph
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Cheers,
Stan H.
Answer by drk(1908)   (Show Source): You can put this solution on YOUR website!
This question requires unit conversions or unit rates. The question is:
.
We convert minutes to hours.
60 minutes = 1 hour, so we write

Notice minutes in the denominator and then minutes in the numerator. We can cancel them to get miles / hr as

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