Multiple choice

If a person increases his vehicle's speed by 50%, he reaches the office 25 minutes early. If the distance from the office is 60 km, find the increased speed of the vehicle.

  1. 90 km/hr

  2. 72 km/hr

  3. 65 km/hr

  4. 55 km/hr

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

Let original speed be v. New speed is 1.5v. Time difference: 60/v - 60/1.5v = 25/60 hours. 60/v - 40/v = 5/12. 20/v = 5/12, so v = 48 km/hr. Increased speed = 1.5 * 48 = 72 km/hr.

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