A man rows to a place situated 100 km away and comes back in 10 hours. He can row 12 km downstream or 8 km upstream in same time. What is the speed of the stream?

A

$$\left(\frac{20}{9}\right)$$ km/hr

B

$$\left(\frac{23}{8}\right)$$ km/hr

C

$$\left(\frac{29}{5}\right)$$ km/hr

D

$$\left(\frac{25}{6}\right)$$ km/hr