An interesting case for a race

In a car race, car AA takes t=5t=5 seconds less than car BB to finish, and passes the finishing point with a speed vv m/s faster than car B.B.

Assume that both cars and AA and BB start from rest, and travel with constant accelerations of a1=9 m/s2\displaystyle a_1=9\text{ m/s}^2 and a2=4 m/s2,\displaystyle a_2=4\text{ m/s}^2, respectively.

Find v.v.

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