Solve the problem.
-Sue can sew a precut dress in 3 hours. Helen can sew the same dress in 2 hours. If they work together, howlong will it take them to complete sewing that dress? Give your answer rounded to one decimal place, ifnecessary.
A)1.2 hr
B)5 hr
C)1.8 hr
D)2.5 hr

Question

Quizplus · Accepted Answer

When working together, their combined rate is the sum of their individual rates. Sue's rate is 1/3 dress per hour, and Helen's rate is 1/2 dress per hour. Together, they sew 1/3 + 1/2 = 5/6 of a dress per hour. Therefore, it takes them 1 / (5/6) = 6/5 = 1.2 hours to complete the dress together.

Solve the Problem. -Sue Can Sew a Precut Dress in 3 Hours. Helen