Two swimmers start from point A on one bank
of a river to reach the point B on the other bank
lying directly opposite to point A. One of them
crosses the river along the straight line AB,
while the other swims at right angles to the
stream and then walks the distance which he has
been carried away by the stream to get to the
point B. The velocity (assumed uniform) of his
walking if both the swimmers reached the point
B simultaneously (velocity of each swimmer in
still water is 2.5 kmh-1
and the stream velocity is
2.0km h-1
)
(a) 1km/h (b) 2km/h
(c) 3km/h (d) 4km/h
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