एक व्यक्ति 40 किमी/घंटा की गति से गाड़ी चलाकर ऑफिस 1 मिनट पहले पहुँच जाता है, जबकि 36 किमी/घंटा की गति से गाड़ी चलाने पर वह ऑफिस 3 मिनट देर से पहुँचता है। घर से ऑफिस जाने में वह कितनी दूरी (किमी में) तय करता है?

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RRB ALP CBT I 17 Aug 2018 Shift 2 Official Paper
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  1. 32
  2. 28
  3. 24
  4. 30

Answer (Detailed Solution Below)

Option 3 : 24
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दिया गया है:

40 किमी/घंटा की गति से चलने वाला व्यक्ति 1 मिनट पहले कार्यालय पहुँचता है, जबकि 36 किमी/घंटा की गति से चलने पर वह 3 मिनट देरी से पहुँचता है।

प्रयुक्त अवधारणा:

1. 1 मिनट = 60 सेकंड

2. दूसरी = गति × समय

3. 1 मीटर/सेकंड = 18/5 किमी/घंटा

4. 1 किमी = 1000 मीटर

गणना:

40 किमी/घंटा = 40 × 5/18 = 100/9 मीटर/सेकंड

36 किमी/घंटा = 36 × 5/18 = 10 मीटर/सेकंड

3 मिनट = 180 सेकंड

मान लें कि दूरी D मीटर है।

​प्रश्न के अनुसार,

\(\frac {D}{10} - \frac {D}{\frac {100}{9}} = 180 + 60 \)

⇒ \(\frac {D}{10} - \frac {9D}{100} = 240\)

⇒ \(\frac {D}{100} = 240 \)

⇒ D = 24000

अब, दूरी = 24000 ÷ 1000 = 24 किमी

∴ तय की गयी दूरी 24 किमी है।

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