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Average speed

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Senior Manager
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Average speed [#permalink] New post 14 Feb 2009, 14:00
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

2 dogsleds raced across a 300 mile course. Team A finished the course in 3 fewer hours than did Team B. If Team A's average speed was 5 miles per hour greater than that of Team B, what was Team B's average speed in miles per hour?

(a) 12
(b) 15
(c) 18
(d) 20
(e) 25
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SVP
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Re: Average speed [#permalink] New post 14 Feb 2009, 14:59
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vksunder wrote:
2 dogsleds raced across a 300 mile course. Team A finished the course in 3 fewer hours than did Team B. If Team A's average speed was 5 miles per hour greater than that of Team B, what was Team B's average speed in miles per hour?

(a) 12
(b) 15
(c) 18
(d) 20
(e) 25


Time for A = x
Time for B = x+3

Speed for A = y + 5
Speed for B = y

x(y+5) = (x+3)y
x = 3y/5
x(y+5) = 300
(3y/5) (y+5) = 300
y^2 + 5y - 500 = 0
y = 20
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GT

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Re: Average speed [#permalink] New post 15 Feb 2009, 19:20
i get 20 as well

same work as GT except, when i got to the quadratic, i just plugged in ans choice..20 seemed the right number since i had 20*25=500
Re: Average speed   [#permalink] 15 Feb 2009, 19:20
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