self Maths Puzzle

viru dhoni speed is 5:3.started runnig clockwise in a round field.every round is 0.5km .so when viru is meeting dhoni 6th time in race how much distance he covered??

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self Other Question

f(1)=1.6 and f(1)+f(2)+...+f(n) is between 24 and 27 find value of n?? a square with side 5cm mid pt of the sides are joined to form another square if this process is repeated find perimeter of 9th square