A group of friends is addressing wedding invitations. Casey can address 21 envelopes in one hour, Anne can address 45 envelopes in two hours, and Paula can address 63 envelopes in three hours. About how long will it take them to address 370 envelopes?

Question

anonymous · Answer

6.49 hours
5.74 hours
21.50 hours
17.21 hours
@campbell_st

campbell_st · Answer

based on the information the hourly rate is 

casey = 21, anne = 22.5 and paula = 21  so its 64.5 per hour

so the time is 370/64.5 =

anonymous · Answer

@campbell_st B?

campbell_st · Answer

that would be my guess