X మరియు Y అనే రెండు రైళ్లు సగటున గంటకు 80 కి.మీ మరియు గంటకు 90 కి.మీ వేగంతో A నుండి B వరకు ప్రయాణిస్తాయి. Y కన్నా X ప్రయాణానికి ఒక గంట ఎక్కువ సమయం తీసుకుంటే, A మరియు B ల మధ్య దూరం _____.

  1. 360 కి.మీ.
  2. 720 కి.మీ.
  3. 540 కి.మీ.
  4. 630 కి.మీ.

Answer (Detailed Solution Below)

Option 2 : 720 కి.మీ.
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ఇచ్చిన:

X మరియు Y అనే రెండు రైళ్లు సగటున గంటకు 80 కి.మీ మరియు గంటకు 90 కి.మీ వేగంతో A నుండి B వరకు ప్రయాణిస్తాయి.

ఫార్ములా:

వేగం = దూరం / సమయం

లెక్కింపు:

దూరం x కి.మీ

ప్రశ్న ప్రకారం

x/80 – x/90 = 1

⇒ (9x – 8x)/720 = 1

⇒ x = 720 కి.మీ

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