Three postal workers can sort a stack of Mail in 40 minutes, 30 minutes, and 120 minutes, respectively. Find how long it takes them to sort the mail if all three work together

Segment xy is dilated through point m with a scale factor of 2. which segment shows the correct result of the dilation

Icould really use some with this question.

Four individuals pool money together to start a new business and agree to split the profits equally. n invests $6,000, x invests $2,000, y invests $8,000 and z invests $4,000. if the profits for the first month were $100,000, y receives than if the profits were divided in proportion to how much they invested.