Help with A level physics?

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Sonia

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A girl is riding a bicycle at a constant velocity of 3.5ms.At time t=0 she passes a boy B sitting on a bicycle that is stationary.At time t=0 the boy sets off to catch up with the girl.He accelerates uniformly from time t=0 until he reaches a speed of 5.6ms in a time of 5.0s.He then continues at a constant speed of 5.6ms.At time t=T the boy catches up with the girl.T is measuered in seconds.State in terms of T the distance moved by the girl before the boy catches up with her.Please show me how to do this thankyou
 
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