# A steamer goes do

Let the speed of the steamer in still water be x km/h

Speed in downstream = x + 1, Speed in upstream = x - 1

Distance = speed × time

According to the question

9(x + 1) = 10(x - 1)

By cross multiplication

9x + 9 = 10x - 10

x = 19 km/h

Distance between the ports = 9(19 + 1) = 180 km

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