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08 Dec 2016, 14:08
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Difficulty:
25%
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Question Stats:
75% (01:22) correct
25%
(01:28)
wrong
based on 126
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Train A leaves on schedule every 34 minutes and Train B leaves on schedule every 30 minutes. If both trains just left the station simultaneously, how long until the next time the two trains will leave simultaneously?
A. 64 minutes
B. 170 minutes
C. 340 minutes
D. 510 minutes
E. 1020 minutes
A. 64 minutes
B. 170 minutes
C. 340 minutes
D. 510 minutes
E. 1020 minutes
08 Dec 2016, 19:27
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Bunuel
Train A leaves on schedule every 34 minutes and Train B leaves on schedule every 30 minutes. If both trains just left the station simultaneously, how long until the next time the two trains will leave simultaneously?
A. 64 minutes
B. 170 minutes
C. 340 minutes
D. 510 minutes
E. 1020 minutes
A. 64 minutes
B. 170 minutes
C. 340 minutes
D. 510 minutes
E. 1020 minutes
LCM(30,34) =510
Ans D
08 Dec 2016, 23:00
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time should be equal
30*x1 = 34*x2
=>x1/x2 = 34/30 = 17/15 (ratio)
1st time the trains would run simultaneously is :30*17 = 34*15 = 510
second time: ratio *2 = 34/30 => 30 *34 = 34*30 = 1020
so on and so forth...
30*x1 = 34*x2
=>x1/x2 = 34/30 = 17/15 (ratio)
1st time the trains would run simultaneously is :30*17 = 34*15 = 510
second time: ratio *2 = 34/30 => 30 *34 = 34*30 = 1020
so on and so forth...
