A man can row upstream at 10 Km/hr and downstream at 18 Km/hr. Find the man's rate in still water?
Answer & explanation
Correct answer: option 3
Let,
Speed of boat in still water= x
Speed of stream/current = y
According to the question:
Upstream speed (Us) = 10 km/h i.e. x - y = 10 km/h -----1st equation
Downstream speed (Ds) = 18 km/h i.e. x + y = 18 km/h -----2nd equation
Man's speed rate in still water means we have to find x
So, add the both equations:
x - y + x + y = 10 + 18
2x = 28
x = 14 km/hr