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A commuter drives M miles per hour for H hours, then rides a bus that
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24 Sep 2021, 00:05
24 Sep 2021, 00:05
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Question Stats:
61% (01:08) correct
38% (01:44) wrong based on 36 sessions
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A commuter drives M miles per hour for H hours, then rides a bus that travels N miles per hour for the same number of hours. Which of the following represents the commuter’s average speed, in miles per hour, for the entire trip?
(A) M+N/H
(B) M+N/2H
(C) MH + NH
(D) M+N/2
(E) H(M+N)/2
(A) M+N/H
(B) M+N/2H
(C) MH + NH
(D) M+N/2
(E) H(M+N)/2
Re: A commuter drives M miles per hour for H hours, then rides a bus that
[#permalink]
24 Sep 2021, 00:28
24 Sep 2021, 00:28
1
\(M\) miles per hour for \(H\) hours so distance \(= MH\)
Then rides a bus that travels \(N\) miles per hour for \(H\) hours so distance \(= NH\)
Total time \(= 2H\) hours & total distance \(= H(M+N)\)
Average speed = \(\frac{H(M+N)}{2H} = \frac{M+N}{2}\)
Answer D
Then rides a bus that travels \(N\) miles per hour for \(H\) hours so distance \(= NH\)
Total time \(= 2H\) hours & total distance \(= H(M+N)\)
Average speed = \(\frac{H(M+N)}{2H} = \frac{M+N}{2}\)
Answer D
gmatclubot
Re: A commuter drives M miles per hour for H hours, then rides a bus that [#permalink]
24 Sep 2021, 00:28
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