SOLUTION: Arlene and AJ are chemists. AJ can do an emulsion polymerization in 10 hours. If AJ and Arlene work together they can do the experiment in 13 hours. How long will it take Arlene wo

Question 137212: Arlene and AJ are chemists. AJ can do an emulsion polymerization in 10 hours. If AJ and Arlene work together they can do the experiment in 13 hours. How long will it take Arlene working by herself to do the experiment.
AJ= 10
Arlene= x+10
I think the answer is 3 but that's too obvious.
Answer by checkley77(12844) (Show Source): You can put this solution on YOUR website!
SOMETHING IS WRONG WITH THIS PROBLEM.
IF AJ CAN DO THE EXPERIMENT IN 10 HOURS THEN WITH ARLENE'S HELP THE TIME MUST BE LESS THAN 10. 13 DOES NOT MEET THE TEST.
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ABSOLUTELY THE COMBINED TIME HAS TO BE LESS THAN THE 2 SEPARATE TIMES.

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