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by aatech » Wed May 14, 2008 10:02 am
PQR makes a rt traingle where PQ = x and QR = y

So, PR = root[x^2+y^2]

Time to travel Q->R->P = [y/z] + [{root[x^2+y^2]}/z] = [y+[root[x^2+y^2]]]/z Ans C
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