[reachrkata]

May be many thought, OK the problem is simple. And it is in fact so. The actual quant stuff in CAT which is a head ache is the Speed-distance-time part and Work related problems.

Anyway answer is 3/8 as all of you would have got.

Explanation : Sorry, I am usurping someone's wish to post the explanation.
here goes -
a/d = a/b*b/c*c/d = 1/3*2*1/2 = 1/3
b/e = b/c*c/d*d/e = 2*1/2*3 = 3
c/f = c/d*d/e*e/f = 1/2*3*1/4 = 3/8

abc/def = a/d*b/e*c/f = 1/3*3*3/8 = 3/8

Simple right?

Anyway, let me take this opportunity to propose something.
May be people who gave their CAT exams this year, can post in questions to which they couldn't find answers. And we others here can exercise our brains to find the solution.

What do the others say?