Multiple choice

A man travels at 60 kmph on a journey from A to B and returns at 100 kmph. Find his average speed for the journey.

  1. 60 kmph

  2. 75 kmph

  3. 80 kmph

  4. 100 kmph

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

Average speed = 2xy / (x+y) = 2*60*100 / (60+100) = 12000 / 160 = 75 kmph.

AI explanation

Since the distance for both parts of the journey is the same, use the average speed formula for two equal distances: two multiplied by the product of the speeds divided by the sum of the speeds. Substituting the values gives two multiplied by 60 multiplied by 100, all divided by 160. This simplifies to 12000 divided by 160, resulting in an average speed of 75 kmph. The result is B.

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