A girl can row at 5 Km/hr in still water. If the velocity of current is 1 Km/hr and it takes her 1 hr to row to a place and come back, how far is the place.
Answer & explanation
Correct answer: option 4
Speed of boat in still water i.e. x - 5 km/hr
Speed of current/stream i.e. y - 1 km/hr
Upstream speed i.e. x - y = 4 km/hr
Downstream speed i.e. x + y = 6 km/hr
According to the question:
\(\frac{x }{4 }\) + \(\frac{x }{ 6}\) = 1
\(\frac{ 5x}{12 }\) = 1
5x = 12
x = 2.4 km