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7th Class Mathematics Integers Question Bank Integers

  • question_answer
    A lift descends into an underground floor at the rate of 6 metres per minute. If the descent starts from 10 metres above the ground level, how much time will it take to descend 350 metres?

    A)  30 minutes   

    B)  50 minutes

    C)  1 hour         

    D)  1 hour 30 minutes

    Correct Answer: C

    Solution :

       The lift has to descend 360 m so as to reach -350 m, as it is 10 m above the ground level. Given that the lift descends at the rate of 6 m/minute.                 \[360\,m\to \frac{360}{6}\times 1=60\]minute = 1 hour


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