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Round Trip Travel Time Of An fire Brigade

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A fire Brigade travels 10 miles at a speed of 50 miles per hour.

How fast must the fire Brigade travel on the return trip if the round-trip travel time is to be 20 minutes?

 

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SherlockHolmes Expert Asked on 3rd October 2015 in Aptitude Question.
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    • 2 Answer(s)
    Best answer

    Answer – 75miles/hour

    EXPLANATION–
    For 50 miles it takes 1 hour to travel

    So, for 10 miles it takes   10/50   hours
    = (10/50) *60mins
    = 12minutes

    So return time should be 20-12=8minutes

    Speed=10/8 in miles per minute         [Speed=Distance/Time]
    =(10*60)/8 in mile per hour
    =75
    Ans.   75miles/hour

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    saikiranchary Scholar Answered on 3rd October 2015.
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    Time (minutes) = Distance *60 / speed (mph) so 60*10/50 =12 min.
    So we have (20-12=8) minutes for return
    so according to above  formula 60*10/8 =75 (mph)

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    Moshe Expert Answered on 20th December 2022.
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