Consider that a centripetal force can be written as:
Fc=mv2r
where r is the radius.
so in your case: circular distance=2πr
3.25×103=2⋅3.14⋅r
remember to change into meters.
r= 3.25 ×1036.28 = 517m
2,140 = 905*v^2*517
v=√1.1×106905 = 34.9 m/s ≈ 35m/s = 126 km/hr
