5th Class Mathematics Arithmetic Question Bank Arithmetic

  • question_answer A boy walking at a speed of 10 km/hr reaches his school 15 minutes late. Next time his speed increase by 2 km/hr, but still he is late by 5 minutes. Find the distance of his school from his house.     

    A)  20 km             

    B)  30 km

    C)  10 km             

    D)  5 km

    Correct Answer: C

    Solution :

     Here, the difference in time\[=155=10\] minutes \[=\frac{1}{6}\] hours His speed during next journey\[=10+2=12\] km/hr. \[\therefore \]Required distance\[=\frac{12\times 10}{12-10}\times \frac{1}{6}=10\,\,km\]

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