Multiple choice

A person travels for 3 hours at the speed of 40 km/h and 4.5 hrs the speed of 60 km/h. at the end of it, he finds that he has covered 3/5 of the total distance at what average speed should he travel to cover the remaining distance in 4 hrs एक व्यक्ति 3 घंटे 40 किमी/घंटा की गति से और 4.5 घंटे 60 किमी/घंटा की गति से यात्रा करता है। इसके अंत में, वह पाता है कि उसने कुल दूरी का 3/5 भाग तय किया है, शेष दूरी को 4 घंटे में तय करने के लिए उसे कितनी औसत गति से यात्रा करनी चाहिए?

  1. 55 km/hr 55 किमी/घंटा

  2. 65 km/hr 65 किमी/घंटा

  3. 40 km/hr 40 किमी/घंटा

  4. 45 km/hr 45 किमी/घंटा

  5. None of these इनमें से कोई नहीं
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B Correct answer
Explanation

Distance covered in first part: 3 hours × 40 km/h = 120 km. Distance covered in second part: 4.5 hours × 60 km/h = 270 km. Total covered = 390 km. This is 3/5 of total distance, so total distance = 390 × 5/3 = 650 km. Remaining distance = 650 - 390 = 260 km. To cover 260 km in 4 hours: speed = 260/4 = 65 km/h.

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