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18 Jan 2021, 03:00
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Train X's
Speed: 54 Train Y's
Speed: 48
Speed: 54 Train Y's
Speed: 48
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
77% (01:49) correct
23%
(02:19)
wrong
based on 373
sessions
History
Date
Time
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Not Attempted Yet
Train X and Train Y, traveling at their respective constant rates, are moving in the same direction along parallel tracks. Initially, Train X is behind Train Y by 18 kilometers, but after 4 hours, Train X is 6 kilometers ahead of Train Y.
Using the information given, identify an answer that could be the speed of Train X and an answer that could be the speed of Train Y, both in kilometers per hour (k/h). Make only two selections, one in each column.
Using the information given, identify an answer that could be the speed of Train X and an answer that could be the speed of Train Y, both in kilometers per hour (k/h). Make only two selections, one in each column.
|
Train X's Speed |
Train Y's Speed |
Value (k/h) |
| 44 | ||
| 48 | ||
| 49 | ||
| 54 | ||
| 57 |
ShowHide Answer
Official Answer
Train X's
Speed: 54 Train Y's
Speed: 48
Speed: 54 Train Y's
Speed: 48
rocky620
Retired Moderator
Joined: 10 Nov 2018
Last visit: 11 May 2023
Posts: 505
Given Kudos: 229
Location: India
Concentration: General Management, Strategy
Schools: IIMA PGPX'22 IIMB EPGP'22 IIMC PGPEX'22 ISB'22
GMAT 1: 590 Q49 V22
WE:Other (Retail: E-commerce)
18 Jan 2021, 06:06
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Let the speed of train X = a
Let the speed of train Y = b
Initially Train X is 18km behind, but after 4 hours it is 6km ahead.
So, in 4 hours it covered 24kms more than Train Y. Hence we can conclude that Train X's speed is 6km more than that of Train Y.
a-b = 6
Only 54 & 48 satisfy this condition.
Speed of train X = 54
Speed of train Y = 48
Let the speed of train Y = b
Initially Train X is 18km behind, but after 4 hours it is 6km ahead.
So, in 4 hours it covered 24kms more than Train Y. Hence we can conclude that Train X's speed is 6km more than that of Train Y.
a-b = 6
Only 54 & 48 satisfy this condition.
Speed of train X = 54
Speed of train Y = 48
General Discussion
23 Aug 2023, 04:12
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in 4 hours X covers 24 km. So n 1 hr it covers 6km. Find out option that gives 6 difference between values. Only 54 for X and 48 for Y satisfies.
