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10th Class Mathematics Areas Related to Circles Question Bank MCQs - Areas Related to Circles

  • question_answer
    If the wheel of an engine of a train is \[4\frac{2}{7}\,m\] in circumference makes seven revolutions in 4 seconds, then the speed of the train is:

    A) \[\text{25km}/\text{h}\]

    B)  

    C) \[\text{27 km}/\text{h}\]

    D) \[\text{30 km}/\text{h}\]

    Correct Answer: C

    Solution :

    [c] Speed of the train
    \[=7\times \frac{30}{7}\times \frac{60}{4}\times \frac{60}{1000}=27\,km/h\]


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