A man can row 25km upstream and 40km downstream in 9 hours. Also, he can row 35km upstream and 50km downstream in 12 hours. Find the speed of the man in still water.
A. 8kmph
B. 12kmph
C. 7kmph
D. 7.5kmph
E. 6.5kmph
A. 8kmph
B. 12kmph
C. 7kmph
D. 7.5kmph
E. 6.5kmph