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Another quad from Pre

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by gabriel » Fri Aug 10, 2007 7:27 am
Ok, if u notice the 3 points make a right angle triangle with the right angle being at Q ... the hypotenuse is RP which is equal to root( x^2+y^2) ..

So the total distance to be traveled is y+root(x^2+y^2) .. (y being the distance between Q and R )..

now it is given that the speed is z miles/hr ..

also distance = speed*time

So the time taken = distance / speed = (y+root(x^2+y^2))/z .. which is C ..
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by jay2007 » Fri Aug 10, 2007 8:38 pm
Points can be represented diagramatically as follows:

x
P-------Q
\ |
\ |y
\ |
\ |
\ |
\ |
R
PR is root(x^2+y^2)

Answer is (y+root(x^2+y^2))/z
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by tanyajoseph » Sat Aug 11, 2007 3:27 am
Great> Had a flaw in understandin the question personally!
Thanks for helpin me out.
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