A man's speed with the current is 8km/hr and the speed of the current is 20km/hr. The current's speed against the man is: Pick one:
A) 3 km/hr
B) 4 km/hr
C) 5 km/hr
D) 7 km/hr
E) 9 km/hr
Man's rate in still water = (20 - 8) km/hr = 12 km/hr.   Current's rate against the current = (12 - 8) km/hr = 4 km/hr   4 km/hr
<result>B</result>
A man's speed with the current is 8km/hr and the speed of the current is 20km/hr. The current's speed against the man is: