RRB Junior Engineer Stage 1 Model Papers 3

Question : 11 of 100

Marks: +1, -0

A can do a piece of work in 5 days and B in 4 days. How long will they take to do the same work when working together?

Solution:

According to question,
A's 1 day's work

=1/5

B's 1 day's work

=1/4

(A + B)'s day's work

=(1/5+1/4)=9/20

∴ A and B can do work together in

20/9

2 2/9

days

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