a) Seriously you don't know?
1 hr = 60 mins
4 hr = 60 X 4
= 240 mins
4 hr 24 min = 240 mins + 24 mins
= 264 mins
bi) Average speed = distance/time
= 374/4 hr 24 min
= 85km/h
bii) 1km = 1000m
374km = 1000 X 374
= 374000m
1 hr = 3600 secs
4 hr 24 mins = 3600 X 4 + 24 X 60
= 14400 + 1440
= 15840 secs
Speed = distance/time
= 374000/15840
= 23.6 m/s (3 significant figures)