Multiple choice

A man travels some distance at a speed of 12 km/hr and returns at a speed of 9 km/hr. If the total time taken by him is 2 hrs 20 min, the distance is एक आदमी कुछ दूरी 12 किमी/घंटा की गति से तय करता है और 9 किमी/घंटा की गति से लौटता है। यदि उसके द्वारा लिया गया कुल समय 2 घंटे 20 मिनट है, तो दूरी है

  1. 35 Km 35 किमी

  2. 21 Km 21 किमी

  3. 9 Km 9 किमी

  4. 12 Km 12 किमी

  5. 13 km 13 किमी
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D Correct answer
Explanation

Let one-way distance be d km. Time for onward journey = d/12 hours, return journey = d/9 hours. Total time: d/12 + d/9 = 2 hours 20 minutes = 7/3 hours. Solving: d(1/12 + 1/9) = 7/3, so d(7/36) = 7/3, giving d = 12 km. Total distance traveled is 24 km.

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