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A boat travels downstream for 14km and upstream for 9km. If the boat took total of 5 hours for its journey. What is the speed of the river flow if the speed of the boat in still water is 5km/hr?
8km/hr.
2km/hr.
6km/hr.
5km/hr.
Solution: Let the speed of the stream be x km/hr. Upward speed = (5 – x)km/hr. Downward speed = (5 + x)km/hr. 14/(5+x) + 9/(5-x) = 5 => x = 2km/hr.
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