Question 140083
when people work together to complete a task,
__ each person completes some fraction of the task based on their individual rate


for example __ if Mike can build a shed in 10 hours,
__ when he works with a group that can build it in 3 hrs; Mike does 3/10 or 30% of the job


the individual fractions sum to 1, the whole task


let x=time together __ x/5+x/3=1 __ multiplying by 15 __ 3x+5x=15 __ 8x=15


dividing by 8 __ x=15/8 __ x=1.875