Physics Question - What is the speed of the bike at the 5m mark?

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mike

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Two physics students are trying to determine the instantaneous speed of a bike 5 metres from the start of the 1000 metre sprint. The bike covers 10 metres in 4 seconds. If the acceleration was constant, what was the instantaneous speed of the bike at the 5 metre mark?

I know the answer is 3.5m/s and I'm quite sure that the 1000m sprint bit is irrelevant. So if a bike covers 10m in 4s at a constant acceleration, what is the bikes instantaneous speed at the 5m mark? I need to know exactly how you would work this out.

Thanks
 
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