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8th Class Mathematics Related to Competitive Exam Question Bank Arithmetic

  • question_answer
    A ship sails out to a mark at the rate of 15km/hr and sails back at the rate of 10 km/hr. The average rate of sailing is:

    A) 12.5km/hr             

    B) 12km/hr

    C) 25km/hr                

    D) 5km/hr

    Correct Answer: B

    Solution :

    Ship sails out to a mark at the speed \[=\frac{350}{7}=Rs.50.\] km/hr and ship sails back at the speed \[\frac{1}{12}+\frac{1}{16}=\frac{4+3}{48}=\frac{7}{48}\]km /hr. \[\frac{48}{7}\] Average speed of sailing is given by \[=6\frac{6}{7}\] \[\frac{y}{x}\]


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