SOLUTION: It takes Richard Semmler 4 hours to prepare a Little League baseball field. It takes Larry Gilligan 7 hours to prepare the same field. How long will it take Richard and Larry work

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Question 1162772: It takes Richard Semmler 4 hours to prepare a Little League baseball field. It takes Larry Gilligan 7 hours to prepare the same field. How long will it take Richard and Larry working together to prepare a Little League baseball​ field?
Thank you for the help

Found 2 solutions by amarjeeth123, josgarithmetic:
Answer by amarjeeth123(569) About Me  (Show Source):
You can put this solution on YOUR website!
It takes Richard Semmler 4 hours to prepare a Little League baseball field.
In 1 hour Richard can do (1/4)th of the work.
It takes Larry Gilligan 7 hours to prepare the same field.
In 1 hour Larry can do (1/7)th of the work.
In 1 hour both combined can do (1/4+1/7)th of the field.
In 1 hour both can do (11/28)th of the field.
Therefore the field will be completed in (28/11) hours if both are working together.
Answer=2.5454 hours.

Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
Their combined rate is 1%2F4%2B1%2F7 fields per hours. The question asks for the reciprocal of this.