ఒక వ్యక్తి 5 గంటల్లో ప్రవాహానికి ఎదురుగా 4 కి.మీ మరియు 5 గంటల్లో ప్రవాహ దిశలో 16 కి.మీ ఈదాడు. అయినా ప్రవాహం యొక్క వేగం ఎంత?

This question was previously asked in
RRC Group D Previous Year Paper 70 (Held On: 2 Nov 2018 Shift 2)
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  1. 2.2 కి.మీ/గంట
  2. 3.2 కి.మీ/గంట
  3. 1.2 కి.మీ/గంట
  4. 1.5 కి.మీ/గంట

Answer (Detailed Solution Below)

Option 3 : 1.2 కి.మీ/గంట
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Detailed Solution

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ఇచ్చిన దత్తాంశం:

5 గంటల్లో 4 కి.మీ

5 గంటల్లో 16 కి.మీ

ఉపయోగించిన కాన్సెప్ట్:

ప్రవాహానికి ఎదురుగా  = v - u

ప్రవాహ దిశలో = v + u

v = వ్యక్తీ యొక్క వేగం

u = ప్రవాహం యొక్క వేగం

సాధన:

v + u = 16/5       ---(1)

v - u = 4/5       ---(2)

సమీకరణం 1 మరియు సమీకరణం 2 నుండి

2v = 20/5 = 4 కి.మీ/గంట

⇒ v = 2 కి.మీ/గంట

⇒ u = 1.2 కి.మీ/గంట

∴ ప్రవాహం యొక్క వేగం 1.2 కి.మీ/గంట

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