Two trains, X and Y, travel from A to B at average speeds of 80 km/hr and 90 km/hr respectively. If X takes an hour more than Y for the journey, then the distance between A and B is _____.

  1. 360 km
  2. 720 km
  3. 540 km
  4. 630 km

Answer (Detailed Solution Below)

Option 2 : 720 km
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Detailed Solution

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Given:

Two trains, X and Y, travel from A to B at average speeds of 80 km/hr and 90 km/hr respectively.

Formula:

Speed = distance/time

Calculation:

Let distance be x km

According to the question

x/80 – x/90 = 1

⇒ (9x – 8x)/720 = 1

⇒ x = 720 km

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