SSC CGL 4 Sep 2016 Paper

Question : 51 of 100

Marks: +1, -0

X can do a piece of work in ‘p’ days and Y can do the same work in ‘q’ days. Then the number of days in which X and Y can together do that work is

Solution:

X’s 1 day’s work =

1/p

Y’s 1 day’s work =

1/q

(X + Y)’s 1 day’s work
=

1/p + 1/q

{q+p}/{pq}

∴ Required time =

{pq}/{p+q}

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