Question
A man rows at a speed of 6 km/hr in still water. If the time taken to row a certain distance upstream is 4 times the time taken to row the same distance downstream, what is the speed of the river?
Answer: Option C
LET X BE THE SPEED OF THE RIVER.
DS = (6 + X) KM/HR; US = (6 – X) KM/HR
IF T HOURS IS THE TIME TO ROW DOWNSTREAM THEN 4T HOURS IS THE TIME TO ROW UPSTREAM.
(6 + X)*T = (6 – X)*4T
6 + X = 24 – 4X
X = 3.6 KM/HR
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LET X BE THE SPEED OF THE RIVER.
DS = (6 + X) KM/HR; US = (6 – X) KM/HR
IF T HOURS IS THE TIME TO ROW DOWNSTREAM THEN 4T HOURS IS THE TIME TO ROW UPSTREAM.
(6 + X)*T = (6 – X)*4T
6 + X = 24 – 4X
X = 3.6 KM/HR
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