अपने गृहनगर जाते समय रमेश ने पहले 250 किमी की यात्रा 75 किमी/घंटा की गति से और अगले 250 किमी की यात्रा 85 किमी/घंटा की गति से करता है। पूरी यात्रा के दौरान उसकी औसत गति (दशमलव के 2 स्थानों तक सही) ज्ञात कीजिए।

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SSC CGL 2023 Tier-I Official Paper (Held On: 25 Jul 2023 Shift 2)
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  1. 80.55 किमी/घंटा
  2. 79.69 किमी/घंटा
  3. 79.20 किमी/घंटा
  4. 80.69 किमी/घंटा

Answer (Detailed Solution Below)

Option 2 : 79.69 किमी/घंटा
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Detailed Solution

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दिया गया है:

पहले 250 किमी के लिए रमेश की गति = 75 किमी/घंटा

दूसरे 250 किमी के लिए रमेश की गति = 85 किमी/घंटा

प्रयुक्त सूत्र:

औसत गति = कुल दूरी/कुल लिया गया समय

गणना:

कुल दूरी = 250 + 250 = 500 किमी

कुल लिया गया समय = (250/75) + (250/85)

⇒ 250 × (1/75 + 1/85)

⇒ 250× {(17 + 15)/1275}

⇒ 320/51

औसत गति = कुल दूरी/कुल लिया गया समय

⇒ 500/(320/51) = (500 × 51)/320

⇒ (25 × 51)/16 = 79.68 किमी/घंटा

∴ सही उत्तर 79.68 किमी/घंटा है।

Alternate Method

गणना:

समय गति  दूरी
17 75 1275
15 85

अब,

औसत गति = (1275 × 2)/(17 + 15)

⇒ 2550/32 = 1275/16 = 79.68 किमी/घंटा

∴ सही उत्तर 79.68 किमी/घंटा है। 

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