1220 km apart
rates
320 km/ hr
290 km/hr
___________________________________
x= t* rate
t = time in hours
x = distance in km
__________________
total distance = t1 * 320 Km/h + t2* 290 km/h
because they started at the same time
Total distance = 1220 km = t * 320 Km/h + t* 290 km/h
1220 = (320 + 290 ) t
1220 = 610 t
t = 1200/ 610
t = 2 hours
_______________________--
Answer
2 hours