एक ट्रेन दिल्ली से अमृतसर तक 84 km/hr की चाल से जाती है और 86 km/hr की चाल से वापस आती है। यदि कुल यात्रा में 170 घंटे लगते हैं, तो दिल्ली और अमृतसर के बीच की दूरी ज्ञात कीजिए। (Km में)

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UP Police SI (दरोगा) Official PYP (Held On: 14 Nov 2021 Shift 3)
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  1. 7114
  2. 7334
  3. 7444
  4. 7224

Answer (Detailed Solution Below)

Option 4 : 7224
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UP Police SI (दरोगा) Official PYP (Held On: 2 Dec 2021 Shift 1)
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Detailed Solution

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दिया गया है:

ट्रेन की चाल = 84 किमी/घंटा

वापसी की चाल = 86 किमी/घंटा

प्रयुक्त अवधारणा:

समय = दूरी / चाल 

गणना:

\(T = {D \over S1} \;+\; {D \over S2}\;\;\)

\(170 = {D \over 84} \;+\; {D \over 86}\;\;\)

\(170 = {86D \;+\; 84D \over 7224}\;\)

⇒ 170 × 7224 = 170D

⇒ D = 7224

दिल्ली और अमृतसर के बीच की दूरी 7224 किमी है।

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