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GRE Prep Club Team Member
Joined: 20 Feb 2017
Posts: 2506
Given Kudos: 1055
GPA: 3.39
Two dogsled teams raced across a 300 mile course in Wyoming. Team A fi
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31 Mar 2022, 09:49
31 Mar 2022, 09:49
Expert Reply
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Question Stats:
83% (02:34) correct
16% (03:27) wrong based on 6 sessions
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Two dogsled teams raced across a 300 mile course in Wyoming. Team A finished the course in 3 fewer hours than team B. If team A's average speed was 5 mph greater than team B's, what was team B's average mph?
A. 12
B. 15
C. 18
D. 20
E. 25
A. 12
B. 15
C. 18
D. 20
E. 25
GRE Prep Club Team Member
Joined: 20 Feb 2017
Posts: 2506
Given Kudos: 1055
GPA: 3.39
Re: Two dogsled teams raced across a 300 mile course in Wyoming. Team A fi
[#permalink]
08 Apr 2022, 03:24
08 Apr 2022, 03:24
Expert Reply
Explanation
\(\frac{300}{s}-\frac{300}{s+5}=3\)
\(=\frac{(300s+1500-300s)}{s(s+5)}=3\)
\(=s^2+5s-500=0\)
\(=s^2+25s-20s-500=0\)
\(s=20\)
Ans. D
\(\frac{300}{s}-\frac{300}{s+5}=3\)
\(=\frac{(300s+1500-300s)}{s(s+5)}=3\)
\(=s^2+5s-500=0\)
\(=s^2+25s-20s-500=0\)
\(s=20\)
Ans. D
gmatclubot
Re: Two dogsled teams raced across a 300 mile course in Wyoming. Team A fi [#permalink]
08 Apr 2022, 03:24
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