RRB NTPC Mains or Stage 2 Model Paper 1 with solutions

Question : 85 of 120

Marks: +1, -0

Amrit is twice as good a painter as Kushal and together they finish a piece of work in 6 days. In how many days will Kushal alone finish the work?

Solution:

(4) Time taken by Kushaal= x days
∴Time taken by Amrit =

x/2

days
According to the question,

2/x+ 1/x=1/6

⇒3/x =1/6 ⇒ x = 3 × 6

= 18 days

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