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hope this helps.....
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1) Formula of average speed= total distance/total time taken
Total distance =54+36+18=108/hr
Total time taken=1hr+1hr+1hr=>3hrs
=>108/3
=> 96km/hr
2)20m+10m=>30m
time= sec×sec=>3600
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀=>30/3600
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀=>1m/120sec or
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀=>1m/sec²
hope it helped u unnie...
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