Multiple choice

Bullet train covers 450 km in 2.5 hr. How long will it take to cover the same distance if its new speed is 30 km/hr less than the old speed?

  1. 5 hr

  2. 7.5 hr

  3. 3 hr

  4. 3.5 hr

  5. 2.5 hr

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Old speed = 450 / 2.5 = 180 km/hr. New speed = 180 - 30 = 150 km/hr. Time taken = 450 / 150 = 3 hours.

AI explanation

Using the formula Speed equals Distance divided by Time, the train's original speed is 450 divided by 2.5, which equals 180 km/hr. Its new speed is 150 km/hr, obtained by subtracting 30 from 180. Using the formula Time equals Distance divided by Speed, the new time taken is 450 divided by 150, resulting in 3 hours.