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Working individually, A and B can complete a piece of work in 30 days and 45 days respectively. If B joins A after some days and the whole work is com

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Working individually, A and B can complete a piece of work in 30 days and 45 days respectively. If B joins A after some days and the whole work is completed in 20 days from the beginning, after how many days does B join A ?
A. 15
B. 10
C. 5
D. 12
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Correct Answer - C
A, on the whole workes for 20 days. Let B work for (20-x) days.
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