Multiple choice

If a person walks at 14 km/hr instead of 10 km/hr, he would have walked 20 km more. At which speed he should travel to complete his initial distance in 4 hours? यदि कोई व्यक्ति 10 किमी/घंटा की बजाय 14 किमी / घंटा की गति से चलता है, तो वह 20 किमी अधिक चल सकता है। अपनी प्रारंभिक दूरी को 4 घंटे में पूरा करने के लिए उसे किस गति से यात्रा करनी चाहिए?

  1. 15.5 Km/h किमी/घं

  2. 12.5 Km/h किमी/घं

  3. 14 Km/h किमी/घं

  4. 18 Km/h किमी/घं
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B Correct answer
Explanation

Difference in speed = 4 km/hr, extra distance covered = 20 km. Time taken = 20/4 = 5 hours. Initial distance = 10 × 5 = 50 km. To cover 50 km in 4 hours: Speed = 50/4 = 12.5 km/hr. The time calculated is the time actually walked at both speeds.

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