Multiple choice

A bus covers a certain distance in 12 hour. If the speed of bus in increased by 10 km. /hr., the same distance would have been covered in 10 hr. Find the distance covered. एक बस किसी दूरी को 12 घण्टे में तय करती है। यदि बस की चाल 10 किमी./घण्टे बढ़ा दी जाय तो अब बस वही दूरी 10 घण्टे में तय करती है । बस द्वारा तय की गयी दूरी ज्ञात करें ।

  1. 480 Km/किमी

  2. 600 Km/किमी

  3. 720 Km/किमी

  4. 800 Km/किमी

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B Correct answer
Explanation

Let the original speed be v km/hr. Distance = speed × time, so d = 12v. When speed increases by 10 km/hr, the same distance is covered in 10 hours: d = 10(v+10). Equating: 12v = 10v + 100, so v = 50 km/hr. Distance = 12 × 50 = 600 km.