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6th Class Mathematics Related to Competitive Exam Question Bank Distance, Time and Speed

  • question_answer
    A truck travels a distance of 240 km in 6 hours, partly at a speed of 60 km/hr and partly at 30 km/hr. Find the time for which it travels at 60 km/hr.

    A) 3H                  

    B)          2H

    C) 5H                  

    D)          1H

    Correct Answer: B

    Solution :

        Let the truck travels for ?t? hour at 60 km/hr. \[\therefore \,\,60\times t+30\times (6-t)=240\] \[\Rightarrow \,60t+180-30t\,=240\] \[\Rightarrow \,\,30t=60\] \[\Rightarrow \,\,t=2\,hr\]. \[\therefore \]    Truck travels 2 hours at 60 km/hr.


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