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A, B and C can do a piece of work in 7 days, 14 days and 28 days respectively. How long will they taken, if all the three work together?
- A3 days
- B4 days
- C5 days
- D6 days
Correct answer: B
Discussion 1
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0
CCommunity
4 days
1/7 + 1/14 + 1/28 = 7/28 = 1/4 => 4 days
1/7 + 1/14 + 1/28 = 7/28 = 1/4 => 4 days