Multiple choice

A distance of $33$ km is covered in one hour $12$ minutes . If the first $15$ km is covered at the speed of $25$ km per hour , find the speed during the remaining distance .

  1. $35$ km/hr
  2. $20$ km/hr
  3. $30$ km/hr
  4. $15$ km/hr
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Total time = 1 hr 12 min = 1.2 hours. Total distance = 33 km. First 15 km at 25 km/hr takes 15/25 = 0.6 hours. Remaining distance = 33 - 15 = 18 km. Remaining time = 1.2 - 0.6 = 0.6 hours. Speed = 18 / 0.6 = 30 km/hr.

AI explanation

First, convert 1 hour 12 minutes to 72 minutes. The time taken for the first 15 km is 15 divided by 25 hours, which equals 0.6 hours, or 36 minutes. This leaves 72 minus 36, equaling 36 minutes, which is 0.6 hours, for the remaining 18 km. The speed for the remaining distance is 18 km divided by 0.6 hours, giving the result of 30 km/hr.

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