Solve the problem.
-Frank can type a report in 3 hours and James takes 5 hours. How long will it take the two of them typing together?
A) $5 \mathrm{hr}$
B) $\frac{15}{2} \mathrm{hr}$
C) $\frac{15}{8} \mathrm{hr}$
D) $\frac{8}{15} \mathrm{hr}$

Question

Quizplus · Accepted Answer

Frank's rate is $1/3$ of a report per hour, and James's rate is $1/5$ of a report per hour. Together, they type $(1/3 + 1/5) = 8/15$ of a report per hour. To complete 1 report, it takes $15/8$ hours.

Solve the Problem 5hr5 \mathrm{hr}5hr B) 152hr\frac{15}{2} \mathrm{hr}215​hr C) 158hr\frac{15}{8} \mathrm{hr}815​hr D) 815hr\frac{8}{15} \mathrm{hr}158​hr

Solve the Problem $5 \mathrm{hr}$ B) $\frac{15}{2} \mathrm{hr}$ C) $\frac{15}{8} \mathrm{hr}$ D) $\frac{8}{15} \mathrm{hr}$