Multiple Choice Questions on A man travelled a distance of 90Km in 9 hours partly on foot at 8 kmph and partly on bicycle at 17 ........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

A man travelled a distance of 90Km in 9 hours partly on foot at 8 kmph and partly on bicycle at 17 ...........

Quantitative Aptitude ( CCS) Mixture and Alligation
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    A man travelled a distance of 90Km in 9 hours partly on foot at 8 kmph and partly on bicycle at 17 kmph. Find the distance travelled on foot.

    40 km

    Incorrect Answer

    42 km

    Incorrect Answer

    46 km

    Incorrect Answer

    56 km

    Correct Answer
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    Explanation:

    Distance covered in 1 hour on foot = 8 km 
    Distance covered in 1 hour on bicycle = 17 km
    Average distance covered in 1 hour = 90/9 km   = 10km (mean distance)

    Distance covered in        Distance covered in

    1 hour on foot                  1 hour on bicycle

          (8 km)                                  (17 km)

                         \                       /
                         Mean Distance

                               (10 km)

                        /                        \

         (17 – 10)          :           (10 – 8)

                7                                   2 

    Thus out of 9 hours, he took 7 hours on foot
    Distance covered on foot  = (8×7)Km  =56 Km.

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