Question

if a and b complete a work in 12 days and B and C complete same work in 15 days and a is 3 times faster than C then find how many days C need to complete that work​

Answer 1

Answer:

120 days

Step-by-step explanation:

1/a + 1/b = 1/12

1/b +1/c = 1/15

as a is 3 times faster than c

so one day work of c= 3a

substituting this value in equation 1 and subtracting equation 2 from 1 we get

3/c + 1/b - 1/b - 1/c = 1/12- 1/15

2/c = 1/60

c = 120 days.