Frank can type a report in 2 hours and James takes 6 hours. How long will it take the two of them typing together?
A) $\frac{3}{2} \mathrm{hr}$
B) $6 \mathrm{hr}$
C) $3 \mathrm{hr}$
D) $\frac{2}{3} \mathrm{hr}$

Question

Quizplus · Accepted Answer

Frank's rate is 1/2 report per hour, and James's rate is 1/6 report per hour. Together, they type (1/2 + 1/6) = 2/3 report per hour. To complete 1 report, it takes 1 / (2/3) = 3/2 hours.

Frank Can Type a Report in 2 Hours and James 32hr\frac{3}{2} \mathrm{hr}23​hr

Frank Can Type a Report in 2 Hours and James $\frac{3}{2} \mathrm{hr}$