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7th Class Science Time and Motion Question Bank Motion and Time

  • question_answer
    A cyclist travels at an average speed of \[25\,km\,{{h}^{-1}}.\] How long will it take for him to travel a triangular journey through three places \[{{P}_{1}},{{P}_{2}}\]and\[{{P}_{3}}\] as shown in the figure?  

    A)  20 minutes        

    B)  36 minutes        

    C)         1 hour                 

    D)         1 hour 20 minutes

    Correct Answer: B

    Solution :

    The average speed taken by the cyclist \[=25\,km\,{{h}^{-1}}=\frac{25}{60}\,km\,{{\min }^{-1}}\] Total distance travelled \[={{P}_{1}}+{{P}_{2}}+{{P}_{3}}=4+5+6=15\,km\] \[\text{Time}\,\text{taken}\,\text{=}\,\,\frac{\text{Distance}}{\text{Speed}}\] \[=\frac{15}{25}\times 60=\frac{90}{25}=36\,\text{minutes}\]


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