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7th Class Mathematics Integers Question Bank Integers

  • question_answer
    A man descends into an underground floor at the rate of 6 metres per minute. If the descent start from 10 metres above the ground level, how much time will it take to descend 230 metres below the ground?

    A)  30 minutes       

    B)  50 minutes     

    C)  40 minutes        

    D)  1 hour 30 minutes

    Correct Answer: C

    Solution :

    (c) The lift has to descend 240 m so as to reach \[-230\,\,m\]as it is 10 m above the ground level. Given that the lift descends at the rate of 6m/ minute. 6 m \[\to \] 1 minute \[240\,\,m\,\to \frac{\text{240}}{\text{6}}\text{ }\!\!\times\!\!\text{ minutes=40minutes}\]   


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