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Trains M and N are traveling west on parallel tracks

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Intern
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Trains M and N are traveling west on parallel tracks  [#permalink]

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New post 03 Jul 2017, 08:52
Trains M and N are traveling west on parallel tracks. At exactly noon, the front of train M, which is traveling at a constant speed of 80 kilometers per hour (km/h), is at rail crossing at location X, and the front of Train N, which is traveling at a constant speed of 65 km/h, is 30 km west of the rail crossing at location X. The trains continue traveling at their respective speeds until the front of Train M and the from of Train N are simultaneously at the rail crossing at Location Y.
In the table, identify the number of kilometers that the front of Train M has traveled between noon and 12:45 p.m. and the number of kilometers that the front of Train N has traveled between noon and 1:00 p.m.

Front of Train M ||| Front of Train N|||
55
60
65
70
75
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Re: Trains M and N are traveling west on parallel tracks  [#permalink]

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New post 04 Jul 2017, 13:17
2
1
inter wrote:
Trains M and N are traveling west on parallel tracks. At exactly noon, the front of train M, which is traveling at a constant speed of 80 kilometers per hour (km/h), is at rail crossing at location X, and the front of Train N, which is traveling at a constant speed of 65 km/h, is 30 km west of the rail crossing at location X. The trains continue traveling at their respective speeds until the front of Train M and the from of Train N are simultaneously at the rail crossing at Location Y.
In the table, identify the number of kilometers that the front of Train M has traveled between noon and 12:45 p.m. and the number of kilometers that the front of Train N has traveled between noon and 1:00 p.m.

Front of Train M ||| Front of Train N|||
55
60
65
70
75

Dear inter,

I'm happy to respond. :-)

What's very interesting about this problem, and a little astonishing, is how ridiculously easy the real question is, compared to what they could have asked. For example, they asked absolutely nothing about Location Y and where it is or what time they arrived at Location Y. Everything about Location Y is irrelevant to answering the question.

"identify the number of kilometers that the front of Train M has traveled between noon and 12:45 p.m."
We know that Train M has a constant speed of 80 km/hr.

In 1 hour, Train M would cover 80 km.

In 3/4 of an hour, Train M would cover 3/4 of 80 km, or 60 km. The answer to the first question is (B) 60

"identify . . . the number of kilometers that the front of Train N has traveled between noon and 1:00 p.m."
We know that Train N has a constant speed of 65 km/hr.

Therefore, in one hour, Train would cover 65 km. The answer to the second question is (C) 65

Does all this make sense?
Mike :-)
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Re: Trains M and N are traveling west on parallel tracks  [#permalink]

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New post 04 Jul 2017, 13:33
Most of the other information in the question has no value in answering. I wonder why all that was given? Only to waste our time reading it?
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Re: Trains M and N are traveling west on parallel tracks  [#permalink]

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New post 05 Jul 2017, 03:54
This question is very basic, yet awfully wordy.

Speed of Train M = 80 km/h, so distance travelled by it in 45 mins = 60 km.
Speed of Train N = 65 km/h, so distance travelled by it in 60 mins = 65 km.
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Re: Trains M and N are traveling west on parallel tracks   [#permalink] 05 Jul 2017, 03:54
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