श्रीमान् W क्रमशः 37 किमी/घंटा, 5 किमी/घंटा और 8 किमी/घंटा की गति से 370 किमी, 390 किमी और 720 किमी की यात्रा करती है। किमी/घंटा में उनकी औसत गति ज्ञात कीजिए।

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RRB NTPC Graduate Level CBT-I Official Paper (Held On: 06 Jun, 2025 Shift 2)
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  1. 8\(\frac{27}{89}\)
  2. 8\(\frac{28}{89}\)
  3. 9\(\frac{21}{89}\)
  4. 9\(\frac{30}{89}\)

Answer (Detailed Solution Below)

Option 2 : 8\(\frac{28}{89}\)
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Detailed Solution

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दिया गया है:

दूरी 1 (d1) = 370 किमी

गति 1 (s1) = 37 किमी/घंटा

दूरी 2 (d2) = 390 किमी

गति 2 (s2) = 5 किमी/घंटा

दूरी 3 (d3) = 720 किमी

गति 3 (s3) = 8 किमी/घंटा

प्रयुक्त सूत्र:

औसत गति = कुल दूरी / कुल समय

कुल दूरी = d1 + d2 + d3

कुल समय = (d1 / s1) + (d2 / s2) + (d3 / s3)

गणनाएँ:

कुल दूरी = 370 + 390 + 720

⇒ कुल दूरी = 1480 किमी

कुल समय = (370 / 37) + (390 / 5) + (720 / 8)

⇒ कुल समय = 10 + 78 + 90

⇒ कुल समय = 178 घंटे

औसत गति = कुल दूरी / कुल समय

⇒ औसत गति = 1480 / 178 = 740 / 89

⇒ औसत गति = 8\(\frac{28}{89}\) किमी/घंटा

∴ सही उत्तर विकल्प (2) है।

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