एक यात्रा का एक तिहाई भाग 25 किमी/घंटा की गति से तय किया जाता है, अगली एक तिहाई यात्रा 40 किमी/घंटा की गति से तय की जाती है और शेष यात्रा 50 किमी/घंटा की गति से तय की जाती है। पूरी यात्रा के लिए औसत गति (किमी/घंटा में, दशमलव के 1 स्थान तक पूर्णांकित) है:

This question was previously asked in
RRB Group D 13 Sept 2022 Shift 2 Official Paper
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  1. 30.3
  2. 33.3
  3. 25.3
  4. 35.3

Answer (Detailed Solution Below)

Option 4 : 35.3
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Detailed Solution

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दिया है:

n = 3

S1 = 25 किमी/घंटा

S2 = 40 किमी/घंटा

S3 = 50 किमी/घंटा

प्रयुक्त सूत्र:

यदि किसी दूरी को 'n' समान भागों में विभाजित किया जाए, जिनमें से प्रत्येक ने अलग-अलग गति से यात्रा की हो

औसत गति \(\frac{n}{\frac{1}{S_1}+\frac{1}{S_2}+\frac{1}{S_3}+....+\frac{1}{S_n}}\)

जहाँ, n = समान भागों की संख्या

गणना:

औसत गति = \(\frac{3}{\frac{1}{25}+\frac{1}{40}+\frac{1}{50}}\)

औसत गति = \(\frac{3}{\frac{8}{200}+\frac{5}{200}+\frac{4}{200}}\)

औसत गति = 3 ÷ (17/200)

⇒ औसत गति = (3 × 200)/17 = 35.29 ≈ 35.3 किमी/घंटा

पूरी यात्रा की औसत गति 35.3 किमी/घंटा है।

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