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Answered by
2
1.8 km/hr
avg speed= total distance/total time
so 54+36+18/20+30+10
=> 108/60
=>1.8 km
Answered by
1
Step-by-step explanation:
average speed=total distance/total time
54kmph=33.554mph
36kmph=22.369mph
18kmph=11.1847mph
30secs+20secs+10secs=60secs=1min=0.0167hour
therefore, 33.554+22.369+11.1847/0.0167
=725.66mph
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