Boat crossing a stream time taken

AI Thread Summary
To calculate the time taken for a boat traveling at 6 km/h to cross a 1.5 km wide stream flowing south at 4 km/h, the effective speed of the boat across the stream must be determined. The boat's speed across the stream remains 6 km/h, while the stream's current affects its downstream position. The time to cross directly is calculated using the formula time = distance/speed, resulting in 0.25 hours or 15 minutes for one crossing. The return trip would also take the same amount of time, totaling 30 minutes for a round trip. Thus, the overall time taken for the boat to travel directly across the stream and back is 30 minutes.
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Homework Statement


In still water a boat travels at 6km/h. A stream is flowing south at 4km/h. Calculate the time it would take for the boat to travel directly across the stream and back if the stream is 1.5km wide

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