GATE 2019 AE – Question 9

Two trains leave the same point at 7 AM, one north at 80 km/h and the other south at 100 km/h. At what time are they 540 km apart?

Show answer and explanation

Correct answer: (B) 10 AM

Explanation

Opposite-direction motion makes separation increase at 80+100 = 180 km/h. Time to 540 km is 540/180 = 3 hours. Three hours after 7 AM is 10 AM, B.

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