To prevent grounding, a cruise ship anchors 18 km away from a river port. To transport the passengers to the port, the crew uses smaller boats. The smaller boats travel 12 km downstream the same time it takes them to travel 8 km upstream. If the speed of the current is 6 km/h, write expressions for the speed of the boat travelling upstream and travelling downstream. Calculate the time it takes for the small boats to travel upstream from the cruise ship to the port.

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