Problema Solution
It takes a groundskeeper 30 minutes to prepare a Little League baseball field for a game. It takes his assistant 40 minutes to prepare the same field. How long will it take if they work together to prepare the field?
Answer provided by our tutors
let
t = the time need to prepare the field togeteher
the rate of the groundskeeper is 1/30 fields per minute
the rate of his assistant is 1/40 fields per minute
t(1/30 + 1/40) = 1
by solving we find
t = 17.14 min
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if they work together they can prepare the field in 17.14 minutes.