Multiple choice

A man goes to office at a speed of 30 km/h and returns at a speed of 40 km/h. If he takes 35 minutes for the whole journey, then find the distance between his house and office?

  1. 10 k.m.

  2. 20 k.m.

  3. 89 k.m.

  4. 24 k.m.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Let the distance be d km. Time going to office = d/30 hours, time returning = d/40 hours. Total time = d/30 + d/40 = 35/60 hours. Solving: d(1/30 + 1/40) = 7/12, so d(7/120) = 7/12, giving d = 10 km. Option A is correct.

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