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Pls answer my question no.5

Answer»

We KNOW that AVERAGE speed=TOTAL DISTANCE traveled/time taken.
now distance=30+30=60km.
and TIMES t=distance/speed.
so t1=30/40=3/4hours.
and t2=30/20=3/2hours.
so total time=t1+t2=3/2 + 3/4=9/4.
so average speed=60/(9/4)=240/9=26.66kmph



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