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rate n time problem

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by ddm » Tue Aug 19, 2008 9:20 pm
During a recent track meet, Peter ran x meters of the 100 meter dash in 5 seconds; running at the same rate, how many seconds will it take Peter to run z meters of the 200 meter dash?

A)5z/x
B)5zx
C)5x/z
D)5/xz
E)xz/5
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by pepeprepa » Wed Aug 20, 2008 1:04 am
The speed is x/5
The distance is z
So the time is z/(x/5)=5z/x
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Re: rate n time problem

by sudhir3127 » Wed Aug 20, 2008 1:18 am
ddm wrote:During a recent track meet, Peter ran x meters of the 100 meter dash in 5 seconds; running at the same rate, how many seconds will it take Peter to run z meters of the 200 meter dash?

A)5z/x
B)5zx
C)5x/z
D)5/xz
E)xz/5
I also go with A..

Speed = Distance/time
speed here is X/5

Distance = Z mts

thus time = distance/speed..................from the main formula

Z/X/5 = 5Z/x..

hope it helps
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