Question

what's the equation
Keith can finish a job in 10 days and the same job would take Kenneth 6 days. How long would it take Karl working alone, if working together, all three can finish the job in 2 day?

Answer 1

A) inverse of required-time = productivity (work efficiency)
B) Sum the individual productivities, and choose as ur unknown the productivity of KArl
C) when you find it - take the inverse- you got time-of-Karl

Answer 2

? anyone there ?....

Answer 3

1/6 + 1/10 + x = 1/2

Answer 4

@danielle02
The "work problem" explanation at the following link may be helpful:
http://www.purplemath.com/modules/workprob.htm

Answer 5

Keith can do 1/10 in 1 day
Kenneth 1/6 in 1 day
Karl ? in 1 day
Total 1/2 in 1day

Answer 6

x = 14/60 = 7/30

Answer 7

KArl time = 4 and 2/7 days

Answer 8

I'm thinking:
1/6 + 1/10 + 1/x = 1/2.
x = 30/7 days --> 4 2/7 days as reported above by @Mikael

Answer 9

tnx @danielle02

Answer 10

thanks! @Mikael