A man's speed with the current is 18 km/hr and the speed of the current is 3.4 km/hr. The man's speed against the current is  Choose one
A) 9	B) 10.4	C) 11.2	D) 12.5	E) 13

Rationale: "man ' s rate in still water = ( 18 - 3.4 ) km / hr = 14.6 km / hr . man ' s rate against the current = ( 14.6 - 3.4 ) km / hr = 11.2 km / hr . answer : c"
Answer: C