An hour is a unit of time. A kilometre is a unit of distance. Without some comparitive unit of speed, the two are incompatible.
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would depend on which speed you where travelling 60 miles / hour 1000 divided by 60 = 16.7 hours 70 miles / hour 1000 divided by 70 = 14.3 hours 80 miles / hour 1000 divided by 80 = 12.5 hours 90 miles / hour 1000 divided by 90 = 11.1 hours 100 miles / hour 1000 divided by 100 = 10.0 hours 50 km / hour 1000 divided by 50 km = 20.0 hours 60 km / hour 1000 divided by 60 km = 16.7 hours 70 km / hour 1000 divided by 70 km = 14.3 hours 80 km / hour 1000 divided by 80 km = 12.5 hours 90 km / hour 1000 divided by 90 km = 11.1 hours 100 km / hour 1000 divided by 100 km = 10.0 hours
The average speed of the bus would be 90 km/h (450 km divided by 5 hours).
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90 minutes = 1.5 hours so speed = 320/1.5 km per hour = 213.33... recurring km per hour.
305km/90km per hour = 3.39 hours so almost 3 and a half hours