A water? Question really makes no sense. Please rephrase.
As fast as the water is moving.
Boatercycles (Jetskis) can be fast, depending on how immensely fat the person is, and depending on how much water there is and how fast the engine is designed to go
Depends on how steep the hill is.
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it can go faster !
In water or on land? On land, they are not fast but in water they can be fast.
The answer to the riddle "What is in two parts but I go fast on water?" is a "boat." A boat typically consists of two main parts: the hull and the deck. Additionally, boats are designed for speed on water, making them capable of moving quickly across the surface.
Go really fast.
25 MPH on land and 2-3mph in water
Maximum upto 30mph
The size, shape, and fins make the fish go fast. Some are build for speed and have special 'fins' on the top.
Not possible without traveling over water.