40 కిలోమీటర్లు ఎగువకు వెళ్లడానికి ఒక రోవర్కు 8 గంటల సమయం పడుతుంది. అదే దూరం దిగువకు వెళ్లడానికి రోవర్కు 5 గంటల సమయం మాత్రమే పడుతుంది. అయితే, నిశ్చల నీటిలో రోవర్ వేగం ఎంత?

This question was previously asked in
RRB ALP Previous Paper 8 (Held On: 13 Aug 2018 Shift 3)
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  1. 1.5 కి.మీ/గంట
  2. 4.5 కి.మీ/గంట
  3. 6.5 కి.మీ/గంట
  4. 4 కి.మీ/గంట

Answer (Detailed Solution Below)

Option 3 : 6.5 కి.మీ/గంట
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Detailed Solution

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రోవర్ వేగం x మరియు నీటి ప్రవాహ వేగం y అనుకుందాం.

ఎగువకు వెళ్లడానికి వేగం = (x –y)

⇒ 40/ (x – y) = 8

⇒ x – y = 5      ---- (1)

దిగువకు వెళ్లడానికి వేగం = (x + y)

⇒ 40/ (x + y) = 5

⇒ x + y = 8      ----(2)

సమీకరణం 1 మరియు 2 నుంచి

x = 6.5 కి.మీ/గంట

∴ రోవర్ వేగం = 6.5 కి.మీ/గంట
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