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Re: DS -Relative Speed - Set 14 [#permalink]
 29 Jan 2010, 06:30
From A we can deduce that passing time First train already passed 2*70km=140km And it mast pssed only 110km, But second train passed 110km.
So Answer is A,
From B we can deduce noting
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Re: DS -Relative Speed - Set 14 [#permalink]
16 May 2010, 11:10
the ans must be A, there is no other way apart from it (with the given given information) to solve the question, people are misreading the questions and comming up with diffrent answers.
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Re: DS -Relative Speed - Set 14 [#permalink]
26 Sep 2010, 04:02
Consider the 2nd condition the following way:
You are given the average of a set = 50.
{40,50,60}, {10,50,90} are among many others that have the average of 50, including {50,50,50}.
It means that the speed of the train could seriously differ during his travel and, therefore, we can't define the speed of train Q in a moment of time the trains have met.
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Re: DS -Relative Speed - Set 14 [#permalink]
26 Sep 2010, 04:24
Stations X and Y are connected by two separate, straight, parallel rail lines that are 250 miles long. Train P and train Q simultaneously left Station X and Station Y, respectively, and each train traveled to the other’s point of departure. The two trains passed each other after traveling for 2 hours. When the two trains passed, which train was nearer to its destination? (1) At the time when the two trains passed, train P had averaged a speed of 70 miles per hour. (2) Train Q averaged a speed of 55 miles per hour for the entire trip. (1) As P averaged 70 miles per hour at the time when the two trains passed, hence when they passed each other P traveled 2*70=140 miles, so for P it was 110 miles left to cover and for Q 140. P was closer to its destination. Sufficient. (2) Knowing average speed for entire trip won't help us to determine the distance either of train coverd at the time they passed each other (as the average speed at the time the met could have been different). Not sufficient. Answer: A.
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Re: DS -Relative Speed - Set 14 [#permalink]
17 Oct 2010, 05:48
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Re: DS -Relative Speed - Set 14
[#permalink]
17 Oct 2010, 05:48
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