A train travels a certain distance taking 7 hrs in forward
journey, during the return journey increased speed 12km/hr
takes the times 5 hrs.What is the distance traveled
Answer Posted / ravi patel
420 is the correct answer.
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f(X)= 2X-1 + f(X-1) if X is not equal to zeroandiff(X=0)=0, If f(f(X))=81 then the value of X=?
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