Distance = (240 \\\\(\ imes\\\\) 5) = 1200 km.Speed = Distance/TimeSpeed = 1200/(5/3) km/hr. [We can write \\\\(1\\frac{2}{3}\\\\) hours as 5/3 hours]\\\\(\ herefore \\\\) Required speed = \\\\(\\left ( 1200 \ imes \\frac{3}{5} \\right )\\\\) km/hr=720 km/hr.