Sagot :
Cevap:
10
Adım adım açıklama:
akinti hizi, motor hizina ters yonde olduğundan
(motor hizi - akıntı hizi) . zaman = alinan yol
(40-x).3= 90
120-3x= 90
120-90=3x
x= 10 km/sa.
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