math
posted by dolores .
if sam can do a job in 4 days that lisa can do in 6 days and tom can do in 2 days, how long would the job take if sam, lisa, and tom worked together to complete it?

math 
Reiny
Sam's rate = job/4
Lisa's rate = job/6
Tom's rate = job/2
time for all 3 working together
= job/(job/4 + job/6 + job/2)
= job/(11job/12)
= job * 12/(11job)
= 12/11
it would take them 1 1/11 days 
math 
dolores
thanks but the answer is 13 i just don't know how to get it.

math 
Reiny
The answer of 13 days would be totally illogical!
Gee, Tom working alone can do the job in 2 days, and then he even has help, so it would obviously take less than 2 days !!!!
Respond to this Question
Similar Questions

math
vanessa can do a job in 12 days. after she has worked for 4 days, she is joined by susan, and they finish the job together in 2 more days. how long would it have taken susan to do the whole job herself 
math
If Sam can do a job in 4 days that Lisa can do in 6 days and Tom can do in 2 days, how long would the job take if Sam, Lisa, and Tom worked together to complete it? 
math
Sam can do a job in 4 days that Lisa can do in 6 days and Tom can do in 2 days, how long would the job take if Sam, Lisa, and Tom worked together to complete it? 
adult education
If Sam can do a job in 4 days that Lisa can do in 6 days and Tom can do in 2 days, how long would the job take if Sam, Lisa, and Tom worked together to complete it? 
Math
If Sam can do a job in 4 days that Lisa can do in 6 days and Tom can do in 2 days, how long would the job take if they worked together to complete it? 
math
If A can do a job in 6 days that V can do in 5 1/2 days and C can do in 2 1/5 days, how long would the job take if A,B, and C were working together? 
mdu rohtak
Tom takes 3 days to do a piece of work while jerry takes only one day for the same. Together, they both can finish the job in 15 days. In how many days tom will finish the work? 
A.V. M. Sr. sec. school faridabad
Tom takes 3 days to do a piece of work while jerry takes only one day for the same. Together, they both can finish the job in 15 days. In how many days tom will finish the work? 
Dianamic sckul
Tom takd 3 days to do a piece work while jerry take only one day for the same . Together. They both can finish the job in 15 days. In how many days tom will finish the work. 
Maths
Tom takes three days to do a piece of work while Jerry takes only one day for the same. Together they both can finish the job in 15 days so how many days will tom will finish the work