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A can complete a journey in 10 hours. He travels first half of the journey at the rate of 21 km / hr and second half at the rate of 24 km / hr. Find the total journey in km.

Correct answer: B. 224 km

  • A. 220 km
  • B. 224 km
  • C. 230 km
  • D. 234 km

Explanation

Let each half of the journey be x km, so total distance is 2x km. The time equation is x/21 h + x/24 h = 10 h, or x x 45/504 h/km = 10 h, giving x = 112 km and total distance 224 km; 220 km is a nearby estimate caused by rounding the fractional times.

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