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GMAT PREP 2 ?? (x miles & y miles)
Source: Beat The GMAT — Problem Solving |
The solution is explained in the attached doc
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- GMAT Prep 2.doc
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When you see something as huge as this, it signals that you should plug-in numbers and use POE technique.
If y = 4, and x = 0, instead of a triangle, you will have a straight line with the length of 4!
it will be like this Q ------------- R
Now, according to the question, you will walk this line twice, so the total distance will be 8.
Assume z = 2, so it will take you 4 hours to finish the task.
Now once you plug these numbers (x = 0, y = 4, z= 2), there is only one choice that gives you 4.
Reza
If y = 4, and x = 0, instead of a triangle, you will have a straight line with the length of 4!
it will be like this Q ------------- R
Now, according to the question, you will walk this line twice, so the total distance will be 8.
Assume z = 2, so it will take you 4 hours to finish the task.
Now once you plug these numbers (x = 0, y = 4, z= 2), there is only one choice that gives you 4.
Reza
Acc to question..
You will get a right angle triangle .. with P and Q in straight line
and R exactly down the point Q...
Now PQ = x and QR = y..
so PR= sqrt(x^2 + y^2)
Thus time will be Distance/speed
(y+ sqrt(x^2 + y^2))/z
You will get a right angle triangle .. with P and Q in straight line
and R exactly down the point Q...
Now PQ = x and QR = y..
so PR= sqrt(x^2 + y^2)
Thus time will be Distance/speed
(y+ sqrt(x^2 + y^2))/z
