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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 _____.

A360 km

B720 km

C540 km

D630 km

Answer:

B. 720 km

Read Explanation:

Let distance be x km x/80 – x/90 = 1 ⇒ (9x – 8x)/720 = 1 ⇒ x = 720 km


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