Question 887405

Town A and Town B are on a river which flows at 5km/h. A ferry which travels at 10 km/h completes the round trip from A to B and back again in 1 hour.At what speed must the ferry trvael to do the trip in half an hour?

Thanks
<pre>
It needs to travel at approximately {{{highlight_green(highlight_green(16.51387819))}}} km/h
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