A man rows a distance of 72 km in still water in 8 hours. Speed of the stream is 6 km/hr. What is the downstream speed (in km/hr) of the man?
Show answer & explanation
Correct answer: B
Explanation
Given:
Distance in still water = 72 km, Time = 8 hours
Speed of the current = 6 km/h
According to the formula:
Speed in still water = Distance / Time
Speed downstream = Speed in still water + Speed of the current
Speed in still water = 72 / 8 = 9 km/h
Speed downstream = 9 + 6 = 15 km/h