Multiple choice general knowledge

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.

  1. 220

  2. 224

  3. 230

  4. 234
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Let total distance be 2d km. Time for first half: d/21 hours. Time for second half: d/24 hours. Total time: d/21 + d/24 = 10. Solving: d(45/504) = 10, so d = 112 km. Total distance = 2d = 224 km.

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