Sagot :
Cevap:
Adım adım açıklama:
toprak yol=x
Asfalt yol=400-x
Toprak yoldaki süre=x/40
asfalt yoldaki süre=(400-x)/80
(x/40)+[(400-x)/80]=8
(2x+400-x)/80=8
x+400=640
x=240 km
km:400
asfalt hızi:80
toprak hızı:40
yolun tamami saati:8
8/2:4
40×4=160
80×4=320
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