Calculating Original Speed of Truck Travelling 41.7m in 6.2s

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if a truck covers 41.7 meters in 6.2 seconds awhile slowing down slowly to final speed of 3.5 m/s.whats its oringal speed?
 
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Please show what you've tried. The problem is very basic kinematics, you should refer to your book, I'm sure it has thorough explanations.
 

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