Thread: Problem involving work

I think I figured it out but here is the problem
One person can do a task in 10hrs, a second can do it in 15 and the third can do it in 20. Together how long will it tak
so here is what I came up with
x/10+x/15+x/20=1
60(x/10+x/15+x/20)=1*60
6x+4x+3x=60
13x=60
13x/13=60/13
x=4.62

It's right.

Hello, roachbeats!

I think I figured it out

One person can do a task in 10 hrs, a second in 15 hours, and a third in 20 hours.
Together, how long will it take?

So here is what I came up with: .

. .

. .

Absolutely correct! . . . Lovely work!