# math/117

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Jack usually mowes his lawn in 7 hours. Marilyn can mow the same yard in 4 hours. How musch time would it take for them to mow the lawn together?

• math/117 -

3 hrs

• math/117 -

jack mows (1/7) lawn per hour
marilyn mows (1/4) yard per hour

together they mow 1/7 + 1/4 yard per hour
= 4/28 + 7/28 = 11/28 yards per hour
so

• math/117 -

Which one is the answer? 3 or 2.54?

• math/117 -

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