and how much is its fare?
In 2012 fare was $4.86,  it rose to $5.87 in 2016, before dropping to $5.16 in 2017. In 2017, it  was $6.50, after accounting for the $2.75 per-passenger fare
Fares
The state's per-passenger subsidy in 2012 was $4.86, paid for through taxes. This subsidy rose to $5.87 in 2016, before dropping to $5.16 in 2017. By comparison, the city's per-passenger subsidy for NYC Ferry, in 2017, was $6.50, after accounting for the $2.75 per-passenger fare.

how long is the staton island ferry ride Approximately 25 minutes where is this located? The ferry's single route runs through New York Harbor between the New York City boroughs of Manhattan and Staten Island when it started its service? 1810 who all can ride it? Passengers from  New York Harbor between the New York City boroughs of Manhattan and Staten Island
It is free. By comparison, the city's per-passenger subsidy for NYC Ferry, in 2017, was $6.50, after accounting for the $2.75 per-passenger fare. There is no charge to take the ferry.
Staten Island Ferry Staten Island Ferry Staten Island Ferry
Introduction Fares Fares
 Historically, the Staten Island Ferry has charged a relatively low fare compared to other modes of transit in the area; and since 1997 the route has been fare-free.   By comparison, the city's per-passenger subsidy for NYC Ferry, in 2017, was $6.50, after accounting for the $2.75 per-passenger fare. There is no charge to take the ferry. 
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Staten Island Ferry [SEP] Fares
Due to the city's financial crisis in the mid-1970s, Mayor Abraham Beame submitted a proposal to increase the fare in July 1975. On August 4, 1975, the fare was increased to 25 cents for a round trip, collected in one direction only. The fare increase was intended to earn the ferry service an extra $1.35 million in annual revenue.