Speed = Distance ÷ Time.<br><br>&bull; Distance = 1 km = 1000 m<br>&bull; Time = \(1\frac{3}{5}\) min = \(\frac{8}{5}\) min<br>&bull; Speed = 1000 ÷ \(\frac{8}{5}\) = 1000 × \(\frac{5}{8}\)<br>&bull; Speed = \(\frac{5000}{8}\) = 625 m/min<br><br>Final Answer: 625