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8th Class Mathematics Related to Competitive Exam Question Bank Arithmetic

  • question_answer
    Walking \[{{R}_{1}}%\] th of his usual rate, a boy reaches his school 4 minutes early. Find his usual time to reach the school.

    A) 40min                   

    B) 32min

    C) 28min            

    D) 48min

    Correct Answer: C

    Solution :

    Let usual rate be .x km/min and distance be y km then time is \[\frac{4}{12}=\frac{7}{21}=\frac{21}{63}=\frac{28}{84}=\frac{1}{3}.\] min as per question. \[\frac{1}{3}\] \[\frac{1}{3}\] \[{{b}_{1}},{{b}_{2}}\] \[{{a}_{1}},{{a}_{2}}\] \[{{a}_{1}}\,\,{{b}_{1}}\] \[\frac{y}{x}=28\] (min)


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