Question

A can lay railway track between two stations in 16 days and B can do same work in 12 days. With the help of C, they completed the work in 4 days only. How much time C alone will take to complete the work

Answer 1

Answer:

(A+B+C)’s 1 day work = 1/4

A’s 1 day work =1/8

B’s 1 day work =1/12

C’s 1 day work = 1/4-(1/8+1/12)

=1/4-(3+2/24)

=1/4-5/24

=6-5/24=1/24

Reciprocal=24/1

Therefore C will take 24 days to complete the work

Step-by-step explanation:

Answer 2

Answer:

here you go

Step-by-step explanation:

a = 1/1

b = 1/1

a +b+ c =1/4

c = a+b+ c - (a +b)

= 1/4 - (1/16+1/12)

=1/4 - ( 7/48)

= 12-7/48

=5/48

=48/5 = 9 3/5 days

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