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

  • question_answer
    A car travels a distance of 170 km in 2 hours partly at a speed of 100 km/hr and partly at 50 km/hr. Find the distance travelled at speed of 100 km/hr.

    A) 120km           

    B)          100km

    C) 140km           

    D)          150km

    Correct Answer: C

    Solution :

        Let distance travelled at 100 km/hr be 'x' km. \[\therefore \] Distance travelled at 50 km/hr is \[(170-x)km\].  Total time taken to cover 170 km is 2 hrs. \[\therefore \,\frac{x}{100}+\frac{170-x}{50}=2\] \[\Rightarrow \,\,x+340-2x=200\] \[\Rightarrow \,\,\]x = 140 km \[\therefore \] Distance travelled at 100 km/hr is 140km.


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