54 किमी की दूरी तय करते हुए, एक व्यक्ति ने देखा कि 1 घंटे 15 मिनट तक साइकिल चलाने के बाद, उसके द्वारा तय की गई दूरी शेष दूरी की \(\frac{7}{9}\) थी। उसकी गति (किमी/घंटा में) क्या थी?

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  1. 18.7
  2. 19.9
  3. 18.9
  4. 19.5

Answer (Detailed Solution Below)

Option 3 : 18.9
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दिया गया है:

कुल दूरी = 54 किमी

समय = 1 घंटा 15 मिनट = 1.25 घंटे

तय की गई दूरी = शेष दूरी की \(\frac{7}{9}\)

प्रयुक्त सूत्र:

गति = दूरी ÷ समय

गणना:

माना तय की गई दूरी = x किमी

तो शेष दूरी = 54 - x

x = (7/9) x (54 - x)

⇒ 9x = 7(54 - x)

⇒ 9x = 378 - 7x

⇒ 9x + 7x = 378

⇒ 16x = 378

⇒ x = 378 ÷ 16 = 23.625 किमी

गति = 23.625 ÷ 1.25 = 18.9 किमी/घंटा

∴ व्यक्ति की गति 18.9 किमी/घंटा है।

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