cars overtaking cars.. an mcat problem i swear

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you have 2 cars. car A is a distance C behind car B. A is traveling at 2 m/s and accelerating at 4 m/s^2 when t=0. B is at rest and begins to accel. at 2 m/s^2. A passes B when car B has moved 64 meters, what is the value of C?

this is a straightforward problem but i dont know which equation would link the two cars in order to find C...

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[Rabolisk]

Find how much time has passed in order for car B to move a distance of 64 meters, given that it was initially at restand that its acceleration was 2 m/s^2. Then, using that time, figure out how much distance car A has moved, given that it was initially moving at 2 m/s, and that its acceleration was 2 m/s^2. The difference in this distance will be C. Can you think of the equation?