SOLUTION: jacinta can solve 20 multiplication questions in one minute. her friend can solve the same number in 3 minutes. how long will it take both of them together to solve 20 questions?

Question 215231: jacinta can solve 20 multiplication questions in one minute. her friend can solve the same number in 3 minutes. how long will it take both of them together to solve 20 questions?

Answer by nerdybill(7384) (Show Source): You can put this solution on YOUR website!
jacinta can solve 20 multiplication questions in one minute. her friend can solve the same number in 3 minutes. how long will it take both of them together to solve 20 questions?
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Really, in this case, the fact that there are 20 questions is not relevant.
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Let x = time it takes for both to solve
x(1/1 + 1/3) = 1
x(3/3 + 1/3) = 1
x(4/3) = 1
x(4) = 3
x = 3/4 of a minute
Or
(3/4) * 60 = 45 seconds
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