Multiple choice

P and Q together can complete a work in 12 days. P alone can complete in 20 days.If Q does the work only half a day daily, then in how many days P and Q together will complete the work? P औए Q एक साथ मिलकर एक काम को 12 दिनों में कर सकते हैं | P अकेला इसे 20 दिनों में कर सकता है | यदि Q आधे दिन ही काम करे, तो P और Q मिलकर एकसाथ काम को कितने दिनों में कर लेंगें

  1. 10

  2. 20

  3. 11

  4. 15
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

P's one day work = 1/20. P+Q's one day work = 1/12. Therefore, Q's one day work = 1/12 - 1/20 = (5-3)/60 = 1/30. If Q works half-day daily, Q's contribution = 1/60 per day. Combined P+Q work = 1/20 + 1/60 = 4/60 = 1/15. Therefore, work completes in 15 days.

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