A bike travels 10m in 4s, what was 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 at 5 meters from the start of the 1000 meter sprint. The bike covers 10 meters in 4 seconds. If acceleration was constant, what was the instantaneous speed of the bike at the 5 meter mark

I'm pretty sure the info about the 1000m sprint is irrelevant.
So, if a bike covers 10m in 4s at a constant acceleration, what was the speed of the bike at the 5m mark?

I tied uisng an equation of straight line motion but I got an answer of 5 m/s, which I know is wrong - the answer is 3.5 m/s. I just need to know how to work it out.

Thanks
Vampy.Campy, Constant acceleration does not mean no acceleration, it means that it is accelerating at a constant rate, so the velocity is not constant, but is increasing.
No acceleration = constant velocity.
Constant acceleration = velocity increasing at a constant rate. So acceleration must be taken into account... I think :S
 
Wouldn't it be 2.5m/s ? Because the bike covered 10m in 4s so 10/4 gives you the constant velocity and since acceleration is constant it is irrelevant.
 
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