Multiple choice general knowledge math & puzzles

A train travels a certain distance taking 7 hours for the journey. During the return journey speed is increased by 12km/hr and the journey time becomes 5 hours.What is the distance of one side of the journey?

  1. 210 kms

  2. 30 kms

  3. 60 kms

  4. 240 kms
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Let distance = d. Original speed = d/7 kmph. Return speed = (d/7)+12 = d/5. Solving: d/5 - d/7 = 12, so (7d-5d)/35 = 12, giving 2d = 420, so d = 210 km. The claimed answer A is correct.

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