Formula used :Time = \(\frac{Distance}{Speed}\)Given data: \(Distance = 1440km\) | \(Speed = 80 m/s\)

In order to convert a speed from m/s to km/hr, we must multiply it by a factor of \(\frac{18}{5}\)

Speed in km/hour : \(80*\frac{18}{5} = 288\) km/hr

Therefore, the speed on the other side is \(2*288 = 576\) km/hr

Time taken to cover the distance : \(\frac{1440}{288} + \frac{1440}{576} = 5 + \frac{5}{2}\) = 7 hours and 30 minutes(Option D)

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