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genius_in_the_gene · 2009 July 2nd, 11:08 PM

Their relative speed is 57+63 = 120 floors per min.

Distance covered by joyce = 51-11= 40

So time taken = 40/120 = 1/3 rd of a min

so in 1/3rd min, joyce would travel 1/3*63 = 21 floors

answer 51-21 =30

2009 July 2nd, 11:08 PM	#7 (permalink)
genius_in_the_gene TestMagic Guru Join Date: May 2006 Location: USA Posts: 1,178	Their relative speed is 57+63 = 120 floors per min. Distance covered by joyce = 51-11= 40 So time taken = 40/120 = 1/3 rd of a min so in 1/3rd min, joyce would travel 1/3*63 = 21 floors answer 51-21 =30 _ _ _ _ SIG _ _ _ _