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miles driven...gmat prep

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miles driven...gmat prep [#permalink] New post 10 Dec 2006, 00:19
need some help on this one...

Cheers!
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Intern
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Re: miles driven...gmat prep [#permalink] New post 10 Dec 2006, 00:35
Ritesh wrote:
need some help on this one...

Cheers!


t1 = 5/30 + (x-5)/60

t2= x/60

(t1-t2)/t2

(10 + x - 5 -x )/x

5/x

hence E
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Re: miles driven...gmat prep [#permalink] New post 10 Dec 2006, 00:53
travel time before = 5/30
travel time after = 5/60

hence %age increase = (5/30 - 5/60)/5/30 *100 = 50 %
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 [#permalink] New post 10 Dec 2006, 10:29
yeh now i know wht a fool i have been...thks ppl
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 [#permalink] New post 10 Dec 2006, 11:36
Original travel time = 5/30 + x-5/60 = 5+x/60

If travelled whole distance at 60 time = x/60

Difference in time = (5+x/60) - (x/60) = 5/60

Difference/time if travelled at 60 = (5/60)/ (x/60) = 300/60x = 5/x

Convert to %: 100*5/x = 500/x

E
  [#permalink] 10 Dec 2006, 11:36
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