2. Questions Bank
  3. 8th Class
  4. Mathematics
  5. Algebraic Expressions

8th Class Mathematics Algebraic Expressions Question Bank Algebra

  • question_answer
    A boat goes downstream and covers the distance between two ports in 4 hrs while it covers the same distance upstream in 5 hrs. If the speed of the stream is 2 km ph, the speed of the boat in still water is

    A) 15km/hr                      

    B) 20km/hr

    C) 24km/hr                      

    D) 18km/hr

    Correct Answer: D

    Solution :

    Let the speed of the boat in still water be x km/hr. The speed down stream \[9{{x}^{2}}+49{{y}^{2}}\] The speed up stream \[{{(a+b)}^{3}}-{{(a-b)}^{3}}=\_\_\_\_\_.\] \[{{b}^{3}}+3{{a}^{2}}b\] \[2({{b}^{3}}+3{{a}^{2}}b)\]


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