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A level Physics-equations of motion question

Hello,the question is :
Tracy drives her car at a constant 20m/s. When she passes Stella's car,Stella sets off with a constant acceleration of 10m/s^2.
A) How long does it take for Stella to pass Tracy's car again?
B)How far has Stella travelled when she catches up with Tracy?
The questions are both 2 Marks and I am confused as to how I should go about doing it??
Any help is appreciated.
Original post by smiley_21
Hello,the question is :
Tracy drives her car at a constant 20m/s. When she passes Stella's car,Stella sets off with a constant acceleration of 10m/s^2.
A) How long does it take for Stella to pass Tracy's car again?
B)How far has Stella travelled when she catches up with Tracy?
The questions are both 2 Marks and I am confused as to how I should go about doing it??
Any help is appreciated.

You can use the point at which they pass as t=0 s=0 and use the fact that when Stella passes Tracy both time and displacement for both will be equal so simultaneous equations for both

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