Question 309801
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?
 What equation do you need to find the answer?
:
Let x = time required when working together
Let the completed job = 1
:
The equation
{{{t/4}}} + {{{t/6}}} + {{{t/2}}} = 1