exam Maths Puzzle Numerical Ability

I tried to solve this by using the following formulas.

75=d(miles)/t(hours) -> t= d/75

s(speed)= d/75 -> ???

100= 2d/t+t(2nd lap) -> t+t(2nd lap)=d/50

PLEASE HELP ME

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exam Other Question
Use the compound interest formula above to compute the interest earned on the investment.

$4800 for 1 year computed at 8% compounded quarterly Find the equation of the tangent line to the curve y=e^3x at the point (0,1)

Please Please Help!!