RRB Junior Engineer Stage 1 Model Papers 10

Question : 12 of 98

Marks: +1, -0

A and B working separately can do a piece of work in 9 and 15 days respectively. If they work for a day alternately, with A beginning, then the work will completed in

10 days
11 days
9 days
12 days

Validate

Solution:

Two days work

1/9+1/15={5+3}/45=8/45

Ten days work

5×8/45=40/45=8/9

Remaining work

=1-8/9=1/9

which is done by A on 11th day.
Hence, the work will be completed in 11 days.

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