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by selango » Wed Jul 14, 2010 1:13 am
D=S*T

D+70=(S+5)(T+1)

D+70=ST+5T+S+5

D+70=D+5T+S+5

5T+S=65-->Eqn1

Now D=(S+10)(T+2)

D=ST+10T+2S+20

D=ST+130+20

D=D+150

Additional distance is 150 miles

Hence D
--Anand--
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