Depends entirely on weight.
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There is no direct conversion from horsepower to miles per hour. Horsepower is a unit of energy equal to about 750 watts. Miles per hour is a rate. A small motorcycle engine of 6 HP might reach a speed of 50 MPH. A 6 HP snow blower might reach 1 MPH. A 2,500 HP military tank might reach 40 MPH.
There can be no answer since the two measures are incompatible. 80 cc is a measure of volume - of the engine cylinders whereas miles per hour is a measure of speed. The two measure diffeerent attributes and so conversion between the two is not valid.
Horsepower is a unit of power, but joules is a unit of energy. To convert horsepower to joules, you need an additional time parameter. One horsepower is about 745.7 watts. So a horsepower-hour is 745.7 watt-hours. One watt-hour is 3600 joules. A horsepower-hour is then 745.7 times 3600 = 2684520 joules.
A knot is one nautical mile per hour, equivalent to about 1.151 mph. Divide by this number.
Horsepower doesn't determine speed. Even with the weight of the vehicle, climate (road conditions, etc.) and every other factor, horsepower still doesn't translate to an exact speed, but rather a potential amount of power that can be applied.