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#include <iomanip>
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#include <iostream>
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using namespace std;
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int main() {
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    cout<<setprecision(4)<<fixed;
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    float l;
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    cin>>l;
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    int HarrySpeed,noOneSpeed;
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    cin>>HarrySpeed>>noOneSpeed;
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    int newSpeed=(HarrySpeed+noOneSpeed);
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    float time=l/newSpeed;
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    cout<<time*HarrySpeed;
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}