Multiple Choice Questions on The distance of the School and house of Suresh is 80km One day he was late by 1 hour than the normal........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

The distance of the School and house of Suresh is 80km One day he was late by 1 hour than the normal...........

Quantitative Aptitude ( CCS) Time & distance
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    The distance of the School and house of Suresh is 80km. One day he was late by 1 hour than the normal time to leave for the college, so he increased his speed by 4km/h and thus he reached to college at the normal time. What is the changed speed of Suresh?

     

    28 kmph
     

    Incorrect Answer

    25 kmph
     

    Incorrect Answer

    20 kmph
     

    Correct Answer

    24 kmph

    Incorrect Answer
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    Explanation:

    80/x – 80/(x+4) = 1
    x(x+20) – 16(x+20) = 0
    x = 16kmph
    Increased speed = 20 kmph

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