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03-10-2016
Mathematics

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Find the average speed if an object travels 39 m in 7 seconds.

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04-10-2016

1hr=60mins
1min=60seconds
1hour=60*60=3600seconds

ratio and proportaion
distance/time=distance/time

39/7=x/3600
times both sides by (7*3600)
140400=7x
divide both sides by 7
20057 and 1/7=x

answer is 20057 and 1/7 meters per hour
or
20.0571428km per hour

Answer Link

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