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Seven persons can finish painting a wall in 140 hours working together

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Seven persons can finish painting a wall in 140 hours working together [#permalink] New post   25 Dec 2024, 11:56
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Seven persons can finish painting a wall in 140 hours working together. Four of these people take ‘h’ hours each and the remaining persons take 2h hours each to complete the same amount of work when any one of them works alone. What is the difference between the median and the mean measures of the individual working times of the different people?

A..6

B. 30

C. 84

D. 330

E. 500


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Seven persons can finish painting a wall in 140 hours working together [#permalink]
25 Dec 2024, 11:56
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