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8th Class Mathematics Direct and Inverse Proportions Question Bank Direct and Inverse Proportions

  • question_answer
    A car takes 3 hours to reach a destination by travelling at\[60\text{ }km/h\]. How long will it take while travelling at\[90\text{ }km/h\]?

    A)  1 hour 30 minutes

    B)  1 hour 40 minutes

    C)  2 hours 40 minutes

    D)  2 hours

    Correct Answer: D

    Solution :

    Speed of the car \[=60\text{ }km/h.\] Time taken \[=3\text{ }h\] Speed is increased to\[90\text{ }km/h\]. Time taken is inversely proportional to speed. Let the time taken to cover the distance travelling at\[90\text{ }km/h\] be x h. Then, \[x=\frac{60}{90}\times 3=2\]hours.


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