Multiple choice

A man travelled from City A to city B by train at 120 kmph and returned by car at 80 kmph. Find the average speed for the whole journey.

  1. 100 kmph

  2. 98 kmph

  3. 96 kmph

  4. 94 kmph

  5. 90 kmph
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C Correct answer
Explanation

Average speed for equal distances is 2xy / (x+y). Here, 2 * 120 * 80 / (120 + 80) = 19200 / 200 = 96 kmph.

AI explanation

When equal distances are traveled at different speeds, use the harmonic mean formula for average speed: two times the product of the speeds divided by their sum. The calculation is 2 multiplied by 120 multiplied by 80, then divided by 200. This gives 19200 divided by 200, resulting in an average speed of 96 kmph.

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