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Liam is pulled over for speeding just as he is arriving at work.He

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Manager
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B
Joined: 07 Jun 2017
Posts: 100
Re: Liam is pulled over for speeding just as he is arriving at work.He  [#permalink]

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New post 03 Aug 2017, 03:06
Baten80 wrote:
Let required speed=s
30/s-30/(s-5)=1/5 (4 minutes= 4/60=1/5 hour)
s^2-5s+2250=0
s=50 ans.


Dear,
I am trying to understand your approach
but 4 mins is not 1/5 hour
Can you explain on this? Thank you
Intern
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B
Joined: 31 May 2018
Posts: 9
Re: Liam is pulled over for speeding just as he is arriving at work.He  [#permalink]

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New post 10 Dec 2018, 07:13
quite simply, just plug in -
distance = 30 miles
speed = 50 mph
time = 30/50 = 3/5 hrs = 36 mins

distance = 30 miles
speed = 45 miles
time = 30/45 = 2/3 hrs = 40 mins.

40 - 36 = 4 mins

this is exactly what we need.
so 50 is the answer.
GMAT Club Bot
Re: Liam is pulled over for speeding just as he is arriving at work.He   [#permalink] 10 Dec 2018, 07:13

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