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If the speed of x meters per second is equivalent to the

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Director
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If the speed of x meters per second is equivalent to the [#permalink] New post 25 Feb 2006, 05:50
If the speed of x meters per second is equivalent to the speed of y kilometers per hour, what is y in terms of x? (1 kilometer=1.000 meters)

A) 5x/18
B) 6x/15
C) 18x/5
D) 60x
E) 3.600.000x
Director
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 [#permalink] New post 25 Feb 2006, 06:08
This is an important shortcut if you deal with ratios, speed etc.

It's C

Consequently if you want to express km/h in m/s use 5/18
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 [#permalink] New post 26 Feb 2006, 07:50
C. This fator of conversion is one of the important ones that should be at the fingertips.
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 [#permalink] New post 26 Feb 2006, 17:52
x m/s = y km/h

ykm = y*1000m
1h = 60 mins = 3600 seconds

y km/h = 1000y/3600 = 5y/18 m/s

5y/18 = x
y = 18x/5

Ans C
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 [#permalink] New post 27 Feb 2006, 01:03
Thanks for pointing that out. Are there others that are useful ?

allabout wrote:
This is an important shortcut if you deal with ratios, speed etc.

It's C

Consequently if you want to express km/h in m/s use 5/18
  [#permalink] 27 Feb 2006, 01:03
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