A nile cruise ship takes 20.8 h to go upstream from luxor to aswan a distance of...

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chinalovethworld

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...208 km, and 19.2 h to make...? .. the return trip downstream. assuming the ship's speed relative to the water is the same in both cases calculate the speed of the current in the Nile?
 
1. v upstream=v ship-v water= Δx/Δt upstream
2. v downstream=v ship - v water = Δx/Δt downstream

Use algebra and subtract 1 from 2 to get:
Δx/Δt downstream - Δx/Δt upstream = 2 v water

so v water =Δx/2 (1/Δt downstream - 1/Δt upstream)

=208 km/2 (1/19.2 - 1/20.8) = 0.42 km/hr
 
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