Question

(L2) It takes Suzy 100 minutes to complete her homework assignments. It takes Johnny 2 hours to complete his.

How long (in minutes) will it take both of them to complete their assignments if working together? Round to the
nearest tenth, if necessary.

Answer 1

Suzy completes 1/100 of her homeworks per minute.

Johnny completes 1/120 of his homeworks per minute.

Together, they complete

`(1)/(100)+(1)/(120)=(11)/(600)`

of their homeworks per minute. So, it takes them

`(600)/(11)\approx 54.5`

minutes to complete the homeworks together.