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**motion in a straight line....tough one**

ok, a cyclist is travelling at 10ms^-1. he sees trafic lights ahead at 108m. He carries on cycling for a time T before decelerating and stopping at the lights 16.7seconds after he first saw the lights.

Calculate T

Im a bit stuck because i feel this question doesnt give enough information

If anyone could point me in the right way it would be much appreciated :)