RRB NTPC Mains or Stage 2 Model Paper 5 with solutions

Question : 32 of 120

Marks: +1, -0

A man can do a piece of work in 10 days but with the assistance of his son, the work is done in 8 days. In how many days, his son alone can do the same piece of work?

15 days
22 days
30 days
40 days

Validate

Solution:

(d) (Man + Son)’s one day’s work =

1/8

Man’s one day’s work =

1/10

⇒ Son’s one day’s work =

1/8- 1/10= 1/40

∴ Son can do it in 40 days.

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