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Mike drives 45 mph to work and arrives in 20 minutes. If he
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02 Oct 2017, 22:28
02 Oct 2017, 22:28
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Question Stats:
95% (00:44) correct
5% (00:59) wrong based on 20 sessions
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Mike drives 45 mph to work and arrives in 20 minutes. If he wants to complete the trip in 15 minutes, how fast must he drive?
(A) 42
(B) 50
(C) 54
(D) 57
(E) 60
Kudos for correct solution.
(A) 42
(B) 50
(C) 54
(D) 57
(E) 60
Kudos for correct solution.
Re: Mike drives 45 mph to work and arrives in 20 minutes. If he
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03 Oct 2017, 04:28
03 Oct 2017, 04:28
1
Using the basic formula \(speed = \frac{distance}{time}\), we can easily compute the distance to work as \(45*\frac{1}{3} = 15\), where 45 is the speed and 1/3 is 20 minutes in hours.
Now, we want to compute the speed necessary to do the same trip in 15 minutes, or 1/4 hours. Thus, \(15*4 = 60\). The speed is 60 mph.
Answer E
Now, we want to compute the speed necessary to do the same trip in 15 minutes, or 1/4 hours. Thus, \(15*4 = 60\). The speed is 60 mph.
Answer E
gmatclubot
Re: Mike drives 45 mph to work and arrives in 20 minutes. If he [#permalink]
03 Oct 2017, 04:28
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