Question 107435
Larry does 1/2 the job in 1 hr.
Willy does 1/4 job in 1 hr
David does 1/8 job in 1 hr.
Let x = time
1/2+1/4+1/8
=4/8+2/8+/8
=7/8 job in 1 hr
Just flip the equation to find out how long it takes.
8/7 hr = 1 1/7 hr = 1 hr 60/7 min = 1 hr 9 min (approx)
Ed