Multiple choice

A motor car starts with the speed of 70 km/hr with its speed increasing every two hours by 10 kmph. In how many hours will it cover 345 kms? एक मोटर कार 70 किमी./घंटा की चाल से चलना प्रारम्भ करती है और प्रत्येक दो घंटे में इसकी चाल 10 किमी./घंटा से बढ़ जाती है | कितने घंटों में यह 345 किमी. की दूरी तय करेगी ?

  1. 4 hours 4 घंटे

  2. 4 hours 5 minutes 4 घंटे 5 मिनट

  3. 4 hours 30 minutes 4 घंटे 30 मिनट

  4. 2 hours 2 मिनट

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

Speed starts at 70 km/h, increases by 10 km/h every 2 hours. First 2 hours: 70 km/h covers 140 km. Next 2 hours: 80 km/h covers 160 km. Total in 4 hours = 300 km. Remaining distance = 345 - 300 = 45 km. Speed for next 2 hours = 90 km/h, so 45 km takes 45/90 = 0.5 hours = 30 minutes. Total time = 4 hours 30 minutes.

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