Hi,

Let x represent the time it will take them(in hours) to be 1450 km apart

Question states*** Note:  D = r*t

  540kmph*x + 620kmph*x = 1450km

                      x = 1450km/1160

                      x = 1.25hrs or 1hr 15min

they will be 1450 km apart at 2:45 pm



  

 

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