2. Questions Bank
  3. 8th Class
  4. Mathematics
  5. Direct and Inverse Proportions

8th Class Mathematics Direct and Inverse Proportions Question Bank Direct and Inverse Proportions

  • question_answer
    A Satish takes 24 minutes to reach his school, travelling at\[15\text{ }km/h\]. At what speed must he go to reach his school in 18 minutes?

    A)  \[20\text{ }km/h\]                        

    B)  \[30\text{ }km/h\]        

    C)         \[24\text{ }km/h\]        

    D)         \[18\text{ }km/h\]

    Correct Answer: A

    Solution :

    Let the required speed be ?x? km/h. Speed is inversely proportional to the time taken. \[\therefore \]  \[24:18\,\,:\,\,\,:\,\,x:15\] \[\Rightarrow \]               \[x=\frac{24\times 15}{18}=20\] \[\therefore \] Satish must go at a speed of \[20\text{ }km/h\] to reach his school in 18 minutes.


You need to login to perform this action.
You will be redirected in 3 sec spinner