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Aptitude

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Q1)A, S, M and Dare functions of x and y, and they are defined as follows:

A(x,y)=x+y 

S(x,y)=x−y

M(x,y)=xy

D(x,y)=x/y

where y≠0

A man travels three-fifths of distance AB at a speed of 3a, and the remaining at a speed of 2b. If he goes from B to A and back at a speed of 5c at the same time, then:

  1. 1/a+1/b=1/c
  2. a+b=c
  3. 1/a+1/b=2/c
  4. None of these
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