A man's speed with the current is 21 km/hr and the speed of the current is 4.3 km/hr. The man's speed against the current is  Choose the correct choice:
A) 9.2 B) 10.3 C) 11.5 D) 12.4 E) 13
Man's rate in still water = (21 - 4.3) km/hr = 16.7 km/hr.   Man's rate against the current = (16.7 - 4.3) km/hr = 12.4 km/hr.   Answer:12.4
<result>D</result>
A man's speed with the current is 21 km/hr and the speed of the current is 4.3 km/hr. The man's speed against the current is