exam Maths Puzzle Numerical Ability

the fast freight train made the trip in 6 hours. The next day the slow freight train made the same trip in 8 hours. What was the speed of the slow freight train if the fast freight train traveled 20 mph faster than the slow freight train?

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exam Other Question
solve systems of linear equations by using the addition or substitution method

x+2=y
x+y=6 Use the square root property to solve the equation.
x^2=4