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?
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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?
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
