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A man goes to his office from his house at a speed of 3 km/hr and returns at a speed of 2 km/hr. If he takes 5 hours in going and coming, what is the distance between his house and office?

Correct answer: D. 6 km

  • A. 3 km
  • B. 4 km
  • C. 5 km
  • D. 6 km

Explanation

If the one-way distance is d km, the total time is d/3 hours + d/2 hours = 5 hours. Thus 5d/6 = 5, so d = 6 km. The common wrong choice is 5 km, which treats the given total time as though one speed applied to the whole journey.

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About Time, Speed and Distance

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