Multiple choice

The average speed of a train was slowed down by 20km/hr due to accident. As a result, the train reached the destination by 10 minutes late. If the total distance was 300 km, find the normal time required to reach the destination.

  1. 3 hours

  2. 4 hours

  3. 3.5 hours

  4. 2 hours

  5. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Let normal speed = v km/h, normal time = t hours. v × t = 300. After accident: (v - 20) × (t + 1/6) = 300. Substituting t = 300/v: (v - 20)(300/v + 1/6) = 300. Solving gives v = 150 km/h, t = 2 hours.

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