Speed in still water [tex]=[/tex] 9km
Speed of the current  [tex]=[/tex] 1 km
Answer:
Step-by-step explanation:
Speed of the current [tex]=[/tex] C
Speed of the still water [tex]=[/tex] S
Speed with the current [tex]=[/tex] [tex]([/tex] speed of the still water â‚Š speed of the current [tex])[/tex]
                   [tex]=[/tex] S â‚Š C   Â
Speed with the current [tex]=[/tex] S â‚Š C [tex]=[/tex] 10km
Speed against the current [tex]=[/tex] [tex]([/tex] speed of the still water â‚‹speed of the current [tex])[/tex]
                       [tex]=[/tex] S ₋ C
Speed against the current [tex]=[/tex] S â‚‹ C [tex]=[/tex] 8km
Speed in still water [tex]=[/tex] Speed with the current ₊ Speed against the current[tex])[/tex]÷ 2
                [tex]= ([/tex] 10 ₊ 8 [tex])[/tex] ÷ 2
                [tex]=[/tex] [tex]([/tex] 18 [tex])[/tex] ÷ 2
Speed in still water [tex]=[/tex] 9km
Speed of the current [tex]= ([/tex] Speed with the current ₋ Speed against the current[tex])[/tex] ÷ 2
                   [tex]= ([/tex] 10 ₋ 8 [tex])[/tex] ÷ 2
                   [tex]=[/tex] [tex]([/tex] 2 [tex])[/tex] ÷ 2
Speed of the current  [tex]=[/tex] 1 km