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7th Class Science Time and Motion Question Bank Motion and Time

  • question_answer
    A car at 7:30 am is moving at a constant speed of \[4\text{ }km\text{ }mi{{n}^{-1}}\] and an odometer reading recorded is 28568 km. What would be the odometer reading at 9:15 am?

    A) 28673 km       

    B) 28988 km       

    C)        29255 km     

    D)        28568 km

    Correct Answer: B

    Solution :

    At 7:30 am, the odometer reading of the car = 28568 km Speed of the car \[=4\text{ }km\text{ }mi{{n}^{-1}}\] Total time interval between 7:30 am to 9:15 am = 1 hour, 45 minutes                 = (60 + 45) minutes = 105 minutes     Required distance = speed of the car   \[\times \] time interval        \[=4\times 105\text{ }km=420\text{ }km\] Hence the odometer reading at 9:15 am   \[=28568+420=28988\text{ }km\]


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