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(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.

User Pmkro
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1 Answer

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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.

User Sasha Reid
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7.4k points