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120 2=60km is 1 7; 5 parts left 7-2 then 60*5=300km is the answer 300km or so 120 2*7=420km all the way then 420-120=300km left
120 2=60km is 1 7; 5 parts left 7-2 then 60*5=300km is the answer 300km or so 120 2*7=420km all the way then 420-120=300km left