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A, B and C can do a work in 12, 15 and 2...

A, B and C can do a work in 12, 15 and 20 days respectively. In how many days will they complete the same work together?
A, B तथा C किसी कार्य को क्रमशः 12, 15 तथा 20 दिनों में कर सकते हैं | एक साथ मिलकर वे उसी कार्य को कितने दिनों में पूरा करेंगे?

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