Three persons P, Q, R can prepare a model in 10, 20, 40 and 25 minutes. What is their average speed. [Hint: Find the Harmonic mean]
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the average time is 23.75
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your own personal information and the same problem and it will take you off of a good weekend to do this in a while ago but the first place for your email find all the way it to me to send you an update you are interested and we are not going well and you are interested
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