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Walking at 5 km/h a man reaches his office 10 minutes late; walking at 6 km/h he arrives 5 minutes early. The distance to his office (in km) is:

Competition practiceRatio, Percentage & Commercial Math
  • A7.5
  • B6
  • C8
  • D9

Step-by-Step Solution

The time difference is 15 minutes = 1/4 hour. d/5 − d/6 = 1/4 → d/30 = 1/4 → d = 7.5 km.
Answer: A) 7.5

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