exam Maths Puzzle Numerical Ability

At 5 pm Roger zoomed off from Asteroid. One hour later, Maryanne zoomed off from Asteroid in the opposite direction at a speed 400 kph less than that of Roger. If they were 7900 km apart at 11 p.m how fast did each travel?

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exam Other Question
1. y=3x-1
If x=-2 what is the value of Y.

2. for the equation y = x-5 find the missing value in each ordered pair
(2, ??)
(-3,??)

3. x-y =3
If x =-6 what is the value of Y How can I simplify 4x^-6y^-2 ??

thanks!