Erin and Hannah walk every day as part of their fitness regimen. Erin walks \(20\) km in \(t\) hours, while Hannah walks one kph slower. She covers the same distance of \(20\) km in three hours longer than Erin does. Find \(t\).
\(6.39\) hours
\(9.39\) hours
\(5.39\) hours
\(7.39\) hours
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