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GMAT Practice Question Set # 54 (Question 160-162)

Problem Solving Question # 162: Chemical Air Ventillation  
Time 0 0 : 0 0 : 0 0

A chemical lab is scheduled to go through two air ventillation systems, a basic system and a more advanced system that takes half an hour and two hours respectively to fully ventillate the room. If both ventillation systems were to operate at thee same time with thier respective constant rates, how many hours would it take to fully ventilate the chemical lab?
(A)

1/4
(B)

1/3
(C)

2/5
(D)

5/4
(E)

3/2
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