SOLUTION: a boat takes 2 hours to go 30 km downstream and 3 hours to go the same distance upstream. finds its speed in still water.
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Question 404881: a boat takes 2 hours to go 30 km downstream and 3 hours to go the same distance upstream. finds its speed in still water.
Answer by Tatiana_Stebko(1539) (Show Source): You can put this solution on YOUR website!
If the boat speed is x kmh, river speed is y kmh, then when boat go downsteram it speed is , upstream speed is
a boat takes 2 hours to go 30 km downstream, so downstream speed is kmh, so
a boat takes 3 hours to go 30 km upstream, so upstream speed is kmh
so
Equations system
Add the first equation to the second
.
kmh is the boat speed
The river speed is kmh
Answer The boat speed is 12.5 kmh
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