If you divide the distance by the time, you get the average speed during the 1.5 hours.
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A.167 km/h
15.3333
4 hours 15 minutes = 4.25 hours. 4.25 hours @ 80 km per hour = 4.25*80 = 340 km.
1000 metres = 1 kilometre so 250 m = 250/1000 km = 0.25 km
2.4 hours