A boat racer can row $$21\frac{3}{2}$$ km/h in still water. If the speed of river is 12.5km/hr, it takes him 40 minutes to row to a place and back, how far off is the place (consider up to two decimals)?

A

$$5\frac{5}{27}$$ km

B

$$5\frac{2}{5}$$ km

C

$$4\frac{5}{27}$$ km

D

$$3\frac{5}{27}$$ km