Question 1203582

{{{Average_speed = total_distance/ total_time}}}


total distance={{{3km+5km+3km=11km}}}


{{{time=distance/speed}}}


{{{total_ time=3km/ (60(km/h))+5km/ (120(km/h))+3km/ (40(km/h))=(1/20)h+(1/24)h+(3/40)h=(1/6)h}}}


{{{Average_speed = 11km / (1/6)h=66(km/h) }}}