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GRE Prep Club Team Member
Joined: 20 Feb 2017
Posts: 2508
Given Kudos: 1053
GPA: 3.39
The figure above represents a system of roads along which traffic flow
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28 Dec 2022, 09:41
28 Dec 2022, 09:41
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Question Stats:
40% (01:57) correct
60% (01:48) wrong based on 15 sessions
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The figure above represents a system of roads along which traffic flows in the direction indicated by the arrows. If the traffic were to split evenly at each fork of the road system, what percent of the traffic entering fork Z would exit at Y?
A. 87.5%
B. 75%
C. 62.5%
D. 50%
E. 12.5%
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GRE Prep Club Team Member
Joined: 20 Feb 2017
Posts: 2508
Given Kudos: 1053
GPA: 3.39
Re: The figure above represents a system of roads along which traffic flow
[#permalink]
30 Dec 2022, 23:16
30 Dec 2022, 23:16
1
Expert Reply
Roads divide into two after leaving from Z.
50 % move downwards and 50% move upwards
If we notice all vehicles moving downwards will end up taking exit Y.
The upward moving vehicles divide at first junction in 25% (moving upwards ) and 25 % (moving downwards). Again if we notice all vehicles moving downwards will end up taking exit Y.
Vehicles moving upwards from this point again divide, leading to 12.5% moving upwards and 12.5% moving downwards, and these will take exit Y.
Total vehicles taking exit Y= 50% +25% +12.5%= 87.5%
Answer: A
50 % move downwards and 50% move upwards
If we notice all vehicles moving downwards will end up taking exit Y.
The upward moving vehicles divide at first junction in 25% (moving upwards ) and 25 % (moving downwards). Again if we notice all vehicles moving downwards will end up taking exit Y.
Vehicles moving upwards from this point again divide, leading to 12.5% moving upwards and 12.5% moving downwards, and these will take exit Y.
Total vehicles taking exit Y= 50% +25% +12.5%= 87.5%
Answer: A
Re: The figure above represents a system of roads along which traffic flow
[#permalink]
15 Jun 2024, 08:58
15 Jun 2024, 08:58
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