ArithmeticA man rides at the rate of 18 km/hr, but stops for 6 min, to change horses at the end of every 7th km. The time that he will take to cover a distance of 90 km is

A man rides at the rate of 18 km/hr, but stops for 6 min, to change horses at the end of every 7th km. The time that he will take to cover a distance of 90 km is

  1. A

    6 hrs

  2. B

    6 hrs 12 min 

  3. C

    6 hrs 18 min

  4. D

    6 hrs 24 min

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    Solution:

    Solution: Total distance = 90 km

    Speed=18  km/hrtime=90  km18  kmph=5  hrs

    No.of  stops  to change horse Integral part of (907)

      There are 12 stops i.e all multiple of 7, less than 90

    time  takenfor  every  stop=12×6=72  minsTotal  time=5  hrs+60  min+12  mins=6  hrs  12  mins

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