A man's current speed is 15 km/hr, whereas the current's speed is 2.5 km/hr. Against the stream, the man's speed is:
A. 8.5 km/hr
B. 9 km/hr
C. 10 km/hr
D. 12.5 km/hr
Answer:C
A man's current speed is 15 km/hr, whereas the current's speed is 2.5 km/hr. Against the stream, the man's speed is:
A. 8.5 km/hr B. 9 km/hr C. 10 km/hr D. 12.5 km/hr
Explanation: In calm water, man's pace is (15 - 2.5) km/hr = 12.5 km/hr.Man's rate of change in relation to the current = (12.5 - 2.5) km/hr = 10 km/hr.