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# A car travels k kilometers in h hours. How many fewer hours

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VP
Joined: 25 Nov 2004
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A car travels k kilometers in h hours. How many fewer hours [#permalink]  21 Apr 2005, 15:02
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A car travels k kilometers in h hours. How many fewer hours would it take the car to travel the same distance at an average rate of r kilometers per hour?
Intern
Joined: 17 Mar 2005
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[#permalink]  21 Apr 2005, 17:03
weird question but here goes -

first time taken = h1 at speed r1
second time taken = h2 at speed r.

fewer hours taken should be h2-h1 = h1(r1/r-1)
VP
Joined: 25 Nov 2004
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[#permalink]  22 Apr 2005, 17:36
coolcal wrote:
weird question but here goes -
first time taken = h1 at speed r1
second time taken = h2 at speed r.
fewer hours taken should be h2-h1 = h1(r1/r-1)

Senior Manager
Joined: 21 Mar 2004
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[#permalink]  22 Apr 2005, 19:13
Dist time velocity
1. k t1=h v1
2. k t2 r

time taken is lesser in case 2, so t2<t1

difference in time = t1-t2 = h- (k/r)
_________________

ash
________________________
I'm crossing the bridge.........

VP
Joined: 25 Nov 2004
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[#permalink]  22 Apr 2005, 19:27
ashkg wrote:
Dist time velocity
1. k t1=h v1
2. k t2 r
time taken is lesser in case 2, so t2<t1 difference in time = t1-t2 = h- (k/r)

absolutly correct...........................
Senior Manager
Joined: 19 Feb 2005
Posts: 487
Location: Milan Italy
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[#permalink]  25 Apr 2005, 09:58
thearch wrote:
time 2 is k/r

I'll take not of this next time.

mmmm...you will not take this or you will take note of this?
[#permalink] 25 Apr 2005, 09:58
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# A car travels k kilometers in h hours. How many fewer hours

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