Multiple choice

If a car travels a distance with 20% less speed, then it will reach 15 minutes late. What is the usual time (in minutes) taken by the car to travel the same distance? यदि कोई कार 20% कम गति के साथ दूरी तय करती है, तो वह 15 मिनट देरी से पहुंचेगी। समान दूरी तय करने के लिए कार द्वारा लिया जाने वाला सामान्य समय (मिनटों में) क्या है?

  1. 80

  2. 90

  3. 75

  4. 60
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

New speed is 80% of usual. Since speed and time are inversely proportional (for fixed distance), new time = 100/80 × usual time = 1.25 × usual time. This means 25% extra time = 15 minutes. Therefore usual time = 15/0.25 = 60 minutes.

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