693 मीटरच्या वर्तुळाकार मार्गावर, सुजाता आणि अंजली एकाच बिंदूपासून परंतु अनुक्रमे 2.85 किमी/तास आणि 1.5 मीटर/सेकंद वेगाने विरुद्ध दिशेने चालण्यास सुरुवात करतात. ते पहिल्यांदा कधी भेटतील? 

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  1. 6.75 मिनिटांनी
  2. 6.05 मिनिटांनी
  3. 5.04 मिनिटांनी
  4. 4.56 मिनिटांनी

Answer (Detailed Solution Below)

Option 3 : 5.04 मिनिटांनी
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दिलेल्याप्रमाणे:

सुजाताचा वेग = 2.85 किमी/तास

अंजलीचा वेग = 1.5 मीटर/सेकंद

त्यांच्यातील अंतर = 693 मीटर

वापरलेली संकल्पना:

जेव्हा दोन व्यक्ती x किमी/तास आणि y किमी/तास विरुद्ध दिशेने प्रवास करतात तेव्हा सापेक्ष वेग (x + y) किमी/तास असतो.

वेळ = अंतर/वेग

गणना:

2.85 किमी/तास = 2.85 × (5/18)

⇒ 0.80 मीटर/सेकंद

सापेक्ष गती = 0.79 + 1.5 = 2.29 m/s

वेळ = अंतर/सापेक्ष गती

⇒ वेळ = 693/2.29

⇒ वेळ = 302.62 सेकंद

वेळ 5.04 मिनिटे

5.04 मिनिटांनी ते पहिल्यांदा भेटतील.

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