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Work and Rates ( distance )

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Abdulla
 Post subject: Work and Rates ( distance )
 Post Posted: Fri Nov 07, 2008 7:28 pm 
I'm confused with two things:

When the traveler travel towards each other why sometimes we equal the two equations together ad solve and the other time we add the two distance and = to the total distance.
i.e
R1= 240 T1= t+10 min. Total Dis=300
R2=160 T2 = t

Rephrasing my question : why we did 240 (t+1/6)+ 160t = 300 rather than
240(t+1/6)=160t and solve ..

When I have to use either way?
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Jade3
 Post subject:
 Post Posted: Sun Nov 09, 2008 12:01 pm 
The first equation explains a situation, where both travelers meet at a point and the distance between two points is 300 Km. The second equation is incorrect as 240(t+1/6) cannot equal 160t, unless t is negative and we know that time cannot take negative values
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JonathanSchneider
 Post subject:
 Post Posted: Wed Nov 19, 2008 9:08 pm 
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ManhattanGMAT Staff


Posts: 380
Well explained, Jade.
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