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A duck can swim at a maximum speed of 2 m/s with respect to the surface of a calm lake.
What will be the maximum speed of the same duck with respect to water in a river flowing at 6 m/s?
Assume that the duck swims downstream.
$8 \space m/s$
$6 \space m/s$
$4 \space m/s$
$2 \space m/s$