A మరియు B అనేవి P అనే బిందువు నుండి Q అనే బిందువు  వైపు నడవడం ప్రారంభిస్తాయి. P మరియు Q మధ్య దూరం 9 కి.మీ. A బయలుదేరిన తర్వాత 4 నిమిషాలకు B మొదలవుతుంది. A అనేది Q కు చేరిన తర్వాత, వెంటనే తిరిగి వస్తుంది మరియు ఒక కిలోమీటరు నడిచిన తర్వాత Bని కలుస్తుంది. A వేగం 10 నిమిషాకు ఒక కిలోమీటరైతే, నిమిషానికి B వేగం కిలోమీటర్లలో ఎంత?

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RRB ALP Fitter 23 Jan 2019 Official Paper (Shift 1)
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  1. 1/15
  2. 1/8
  3. 1/12
  4. 1/6

Answer (Detailed Solution Below)

Option 3 : 1/12
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Detailed Solution

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A ప్రయాణించిన దూరం  = 9 + 1 = 10 కి.మీ

∴ A తీసుకున్న సమయం = 10 × 10 = 100 నిమిషాలు 

∴ B తీసుకున్న సమయం = 100 - 4 = 96 నిమిషాలు

B ప్రయాణించిన దూరం = 9 - 1 = 8 కి.మీ

∴ B వేగం = 8/96 = నిమిషానికి 1/12 కిమీ

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