P,Q तथा R अकेले एक कार्य को क्रमशः 12, 1...

P,Q तथा R अकेले एक कार्य को क्रमशः 12, 15 तथा 20 दिन में पूरा कर सकते हैं। वे एक साथ मिलकर कार्य को कितने दिन में पूरा करेंगे?

A

4

B

5

C

6

D

3.5

लिखित उत्तर

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The correct Answer is:

B

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