स्थिर जल में नाव की गति और धारा की गति का अनुपात 7:2 है। नाव 8 घंटे में 120 किमी धारा के प्रतिकूल जाती है और 3 घंटे में धारा के अनुकूल x किमी जाती है। x का मान ज्ञात कीजिए। 

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RRB PO Prelims Memory Based Paper (Held On: 4 August 2024 Shift 1)
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  1. 81
  2. 84
  3. 96
  4. 88
  5. 64

Answer (Detailed Solution Below)

Option 1 : 81
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गणना

नाव की गति : धारा की गति = 7 : 2 ⇒ माना, की गति नाव = 7x, धारा = 2x
धारा के प्रतिकूल = 7x − 2x = 5x
धारा के अनुकूल = 7x + 2x = 9x

धारा के प्रतिकूल: 8 घंटे में 120 किमी ⇒ 15 किमी/घंटा ⇒ 5x = 15 ⇒ x = 3
धारा के अनुकूल गति = 9x = 27 किमी/घंटा
3 घंटे में: दूरी = 27 × 3 = 81 किमी

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