A man’s speed with the current is 18 km/hr and the speed of the current is 2.5 km/hr. the man’s speed against the current is : Select the correct option
A) 8.5 km/hr  B) 9.5 km/hr  C) 13 km/hr  D) 12.5 km/hr  E) None of these
Solution   Man's rate in still water = (18-2.5) km/hr = 15.5 km/hr.   Man's rate against the current = (15.5-2.5) km/hr = 13 km/hr Answer 13 km/hr
<result>C</result>
A man’s speed with the current is 18 km/hr and the speed of the current is 2.5 km/hr. the man’s speed against the current is :