Question
A boat travels upstream from B to A and downstream from A to B in 3 hours. If the speed of the boat in still water is 9km/hr and the speed of the current is 3km/hr, the distance A and B is:_______?
Answer: Option D
SPEED DOWNSTREAM = (9+3) KM/HR = 12KM/HR
SPEED UPSTREAM = (9-3) KM/HR = 6 KM/HR
DISTANCE AB = X KM
X/6 + X/12 = 3
=> 2X + X = 36
=> X= 12
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SPEED DOWNSTREAM = (9+3) KM/HR = 12KM/HR
SPEED UPSTREAM = (9-3) KM/HR = 6 KM/HR
DISTANCE AB = X KM
X/6 + X/12 = 3
=> 2X + X = 36
=> X= 12
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