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cat2010
Joined: 26 Nov 2022
Last visit: 18 Mar 2023
Posts: 106
Given Kudos: 12
Location: India
Schools: Foster '25 Northeastern Ross '25 UT Dallas
GMAT 1: 700 Q46 V40
GPA: 3.8
27 Nov 2022, 23:44
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
83% (01:35) correct
17%
(02:00)
wrong
based on 172
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Two trains (Train A and Train B) leave their stations at exactly 6 pm, travelling towards each other from stations exactly 60 miles apart. There are no other stops between these two stations. What time does Train B arrive at its destination?
(1) Train A travels twice as fast as Train B.
(2) At 6:40 pm, the two trains pass each other.
(1) Train A travels twice as fast as Train B.
(2) At 6:40 pm, the two trains pass each other.
28 Nov 2022, 04:32
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Given: Two trains (Train A and Train B) leave their stations at exactly 6 pm, travelling towards each other from stations exactly 60 miles apart. There are no other stops between these two stations.
Asked: What time does Train B arrive at its destination?
Let the speeds of train A & train B be vA & vB respectively.
1. Train A travels twice as fast as Train B.
vA = 2vB
The time when train B arrive at its destination = 60/vB.
Since vA or vB is unknown
NOT SUFFICIENT
2. At 6:40 pm, the two trains pass each other.
Time taken for the trains to pass each other = 60/(vA + vB) = 40/60 = 2/3
vA + vB = 60*3/2 = 90 km/h
The time when train B arrive at its destination = 60/vB.
Since vB is unknown
NOT SUFFICIENT
(1) + (2)
1. Train A travels twice as fast as Train B.
vA = 2vB
2. At 6:40 pm, the two trains pass each other.
Time taken for the trains to pass each other = 60/(vA + vB) = 40/60 = 2/3
vA + vB = 60*3/2 = 90 km/h
vB = 30 km/h
The time takebn by train B arrive at its destination = 60/vB = 60/30 = 2 hours
The time when train B arrive at its destination = 6 + 2 = 8 pm
SUFFICIENT
IMO C
Asked: What time does Train B arrive at its destination?
Let the speeds of train A & train B be vA & vB respectively.
1. Train A travels twice as fast as Train B.
vA = 2vB
The time when train B arrive at its destination = 60/vB.
Since vA or vB is unknown
NOT SUFFICIENT
2. At 6:40 pm, the two trains pass each other.
Time taken for the trains to pass each other = 60/(vA + vB) = 40/60 = 2/3
vA + vB = 60*3/2 = 90 km/h
The time when train B arrive at its destination = 60/vB.
Since vB is unknown
NOT SUFFICIENT
(1) + (2)
1. Train A travels twice as fast as Train B.
vA = 2vB
2. At 6:40 pm, the two trains pass each other.
Time taken for the trains to pass each other = 60/(vA + vB) = 40/60 = 2/3
vA + vB = 60*3/2 = 90 km/h
vB = 30 km/h
The time takebn by train B arrive at its destination = 60/vB = 60/30 = 2 hours
The time when train B arrive at its destination = 6 + 2 = 8 pm
SUFFICIENT
IMO C
28 Apr 2024, 13:25
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I saw the reply from another person but couldn't quite understand
