plas solve the 5th one step by step first to answer is the brailiest
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4/x-y=2
x-y=2 (as speed of upstream is x-y km/hr so d/s)
20/x+y=2
x+y=10(as speed of downstream is x+y km/hr so d/s)
x-y=2
x+y=10
2x=12
x=6 km/hr (speed in still water)
y=4 km/hr (speed of current)
mark it as brainliest
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