SOLUTION: John travelled by car to visit his aunt in Edinburgh. the journey of 18 kilometres took 4hr 9 minutes. what was the average speed?Give your answer in kilometres per hour

Question 1005428: John travelled by car to visit his aunt in Edinburgh. the journey of 18 kilometres took 4hr 9 minutes. what was the average speed?Give your answer in kilometres per hour
Found 2 solutions by Alan3354, Bob10576:
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
John travelled by car to visit his aunt in Edinburgh. the journey of 18 kilometres took 4hr 9 minutes. what was the average speed?Give your answer in kilometres per hour
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To find km/hr, divide the kms by the hours.

Answer by Bob10576(4) (Show Source): You can put this solution on YOUR website!
The question asks for your answer in kilometers per hour.
kilometers per hour can also be written as
kilometers/hour
now replace kilometers with the given value of kilometers and the hours with the given value of hours
but, since the given value of hours isn't completely in hours we have to convert it.
a way to do this is to take the extra minutes and divide them by 60. this will give you the equivalent of 9 minutes in hours.
9/60 = .15
now we add .15 hours to our original 4 hours and plug it into the equation we made before.
4+.15 = 4.15
18/4.15 = km/h
thus 4.337km/h is your answer.
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