Arnab is twice as fast as Bhanu and Bhanu is one third as fast as Chandu If together they can comple...........

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Arnab is twice as fast as Bhanu, and Bhanu is one-third as fast as Chandu. If together they can complete work in 30 days, in how many days can Arnab, Bhanu and Chandu do the work respectively?

60, 180, 240

90, 180, 120

90, 180, 60

90, 60, 180

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Explanation:

Let's Chandu can do the work in 2x days.
Bhanu can do it in 6x days and Arnab can do it in 3x days.
1/2x + 1/6x + 1/3x = 1/30
⇒ 3 + 1 + 2 /6x = 1/30
⇒ x = 30
So, the time taken to complete the work by Arnab, Bhanu and Chandu is 90, 180, 60 days respectively.