एकत्र काम केल्याने, A आणि B पाईप 10 तासांत रिकामी टाकी भरू शकतात. त्यांनी 4 तास एकत्र काम केले आणि नंतर B थांबला आणि A ने टाकी भरेपर्यंत भरत राहिली. टाकी भरण्यासाठी एकूण 13 तास लागले. A ला एकट्याने रिकामी टाकी भरायला किती वेळ लागेल?

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RRB ALP Previous Paper 3 (Held On: 9 Aug 2018 Shift 3)
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  1. 15 तास
  2. 13 तास
  3. 16 तास
  4. 12 तास

Answer (Detailed Solution Below)

Option 1 : 15 तास
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गणना:

एकत्र काम केल्यास, A आणि B पाईप 10 तासांत रिकामी टाकी भरू शकतात,

⇒ 1/A + 1/B = 1/10

त्यांनी एकत्र 4 तास काम केले आणि नंतर A चालू राहिले आणि 13 तासात काम पूर्ण झाले,

याचा अर्थ A ने 13 तास काम केले.

⇒ (4/A + 4/B) + 9/A = 1

⇒ 4/10 + 9/A = 1

∴ A = 15 तास

Alternate Method

टाकी भरण्यासाठी A आणि B = 10 तास = एकूण कामाच्या 100% वेळ लागतो

A आणि B ने 4 तास एकत्र काम केले = एकूण कामाच्या 40%

तर, शिल्लक कामाचे 6 तास= एकूण कामाच्या 60%

एकट्या A ने केलेले काम = 13 - 4 = 9 दिवस

60% काम A द्वारे 9 दिवसात केले जाते

100% काम = (9/60) × 100 = 15 दिवस

∴ काम पूर्ण करण्यासाठी A ला लागणारा वेळ 15 दिवस आहे

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