Multiple choice

One-fourth of a certain journey is covered at the speed of 25 km/hr and the rest is covered at 50 km/hr. Find the average speed for the whole journey.

  1. 35

  2. 45

  3. 55

  4. 40

  5. 28
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Suppose, the total distance is x km. So, one-fourth of the distance is covered in x/100 hours. Rest of the distance is covered in 3x/200 hours. So, avearge speed = total distance/total time = x/(5x/200), i.e. 40. So, the average speed is 40 km/hr. Therefore, option 4 is correct.

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