Multiple choice

A train covers a distance of 14 km in 15 min. If the speed is decreased by 8 km/hr, the time taken by it to cover the same distance will be

  1. 19 min 30 sec

  2. 18 min 30 sec

  3. 17 min 30 sec

  4. 16 min 20 sec

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

Speed = 14 km / (15/60) hr = 56 km/hr. New speed = 56 - 8 = 48 km/hr. Time = Distance / Speed = 14 / 48 hr = 7/24 hr. (7/24) * 60 min = 17.5 min = 17 min 30 sec.

AI explanation

The original speed of the train is calculated using the formula speed equals distance divided by time, which is 14 km divided by 15/60 hours, giving 56 km/hr. When the speed is decreased by 8 km/hr, the new speed becomes 48 km/hr. The new time taken to cover the same 14 km is 14/48 hours, which simplifies to 7/24 hours. Multiplying by 60 gives 17.5 minutes, which is 17 minutes and 30 seconds.

Keep practicing — related questions