RRB Group D Model Paper 2 with solutions

Question : 98 of 100

Marks: +1, -0

A can do a piece of work in 15 days. B can do the same piece of work in 25 days. In how many days will A and B together complete the work?

Solution:

(1) A’s one-day work = 1/15
B’s one-day work = 1/25
A and B’s one-day work
=

1/15+1/25=8/75

∴ A and B together can completethe work in

75/8

days =

9 3/8

days

Go to Question:

Prev Question

Next Question