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maddie953
21.06.2019 •
Mathematics
Aremote-controlled boat can travel at 4 feet per second in calm water. the boat traveled 48 feet with the current, and then it traveled 16 feet against the current in the same amount of time. how fast is the current?
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Ответ:
Speed of the boat against current = (4-c) ft/s
Where, c= speed of the current
Speed = Distance/Time => Time = Distance/Speed
In both cases, time is equal
Therefore,
48/(4+c) = 16/(4-c) => 48(4-c)=16(4+c) => 192-48c = 64+16c => 192-64 = (48+16)c => 128 = 64 c => c= 128/64 = 2 ft/s
The current is travelling at 2ft/s
Ответ:
e
Step-by-step explanation: