SOLUTION: A man in a boat travels along a river. The river has a current: it flows past the shore at a constant speed. the man travels upstream, against the current. Relative to the water, t
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Question 1098988: A man in a boat travels along a river. The river has a current: it flows past the shore at a constant speed. the man travels upstream, against the current. Relative to the water, the boat speed is constant. There is a whiskey bottle on the boat At the instant the boat passes under the bridge, the bottle falls into the water.
for 20 minutes the boat continues upstream at a constant speed. the bottle floats downstream. at the end of 20 minutes, the man reverses the boat (smoothly and quickly; a negligible time interval elapses during turnaround).
The man heads downstream. just like it was upstream, the speed of the boat relative to the water is constant. relative to the water, the downstream speed of the boat turns out to be twice as fast as was the upstream speed. a mile below the bridge the boat picks up the bottle.
relative to the shore what is the constant speed at which this water flows (i.e: how fast is the current?) Answer by ikleyn(52810) (Show Source):
