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
Find the slope of the line passing through the points (-9, -4) and (0, -4). any help on how to solve this chart


Fill in the chart given this linear equation:
y = -2x – 9
x y
-2 -5
-1 -7
0 -9
1 -11
2 -13