8. 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?

A. 0.8 days

B. 1.09 days

C. 1.23 days

D. 1.65 days

E. 1.97 days

So I know that the answer is B but I have no idea what formula I am supposed to use to actually get that answer....

My friend and I did this but there has to be an easier way to do it, right?

[03:57:51 p.m.] Blaze: sam can do 25% in a day...

[03:58:13 p.m.] Blaze: lisa can do... 16.66%

[03:58:23 p.m.] Blaze: and tom can do 50%....

[03:58:59 p.m.] Blaze: in 1 day they can do 91.66%... right?

which also means that together they accomplish about 3.82% an hour

so far i've got 1 day 2 hours... let me go further

[04:01:49 p.m.] Blaze: its also about 0.063% a minute

[04:02:55 p.m.] Blaze: now im at 1 day 2 hours and 11 minutes and like 30 or so seconds

So as you can see... this is not going well...

((DISCLAIMER: I am new to the site and have no idea what I am doing. xD So I am trying to follow the rules but I am not sure if I am putting this in the right section or giving the right amount of information or anything. Sorry if I am doing anything wrong ^^; ))