Multiple choice

A man reduces his speed from 20 km/h to 18 km/h. So, he takes 10 minutes more than the normal time. What is the distance travelled by him? एक आदमी अपनी गति 20 किमी / घंटा से 18 किमी / घंटा कर देता है। तो, वह सामान्य समय से 10 मिनट अधिक लेता है।उसके द्वारा तय की गई दूरी क्या है?

  1. 28 km 28 किमी.

  2. 30 km 30 किमी.

  3. 33 km 33 किमी.

  4. 37 km 37 किमी.

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

Let distance be d km. At 20 km/h, time = d/20 hours. At 18 km/h, time = d/18 hours. Difference in time = d/18 - d/20 = 10 minutes = 10/60 = 1/6 hour. Solving: d(1/18 - 1/20) = 1/6, so d(1/180) = 1/6, therefore d = 180/6 = 30 km.

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