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Let the total distance be S.
S1=S/3m; V1=3m/s; T1=S/9s
S2=S/3m; V2=4m/s; T2=S/12s
S3=S/3m; V3=5m/s; T3=S/15s
average speed=total distance/total time
Avg Speed=S/T1+T2+T3
Avg Speed=180/47=3.829m/s
S1=S/3m; V1=3m/s; T1=S/9s
S2=S/3m; V2=4m/s; T2=S/12s
S3=S/3m; V3=5m/s; T3=S/15s
average speed=total distance/total time
Avg Speed=S/T1+T2+T3
Avg Speed=180/47=3.829m/s
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