Two ports

From port A on the river, the steamer started at an average speed of 12 km/h towards port B. Two hours later, another steamer departed from A at an average speed of 20 km/h. Both ships arrived in B at the same time. What is the distance between ports A and B?

Correct answer:

x =  60 km

Step-by-step explanation:

v1=12 km/h v2=20 km/h  x=v1 t x=v2 (t2) x=12 t x=20 (t2)  12tx=0 20tx=40  Pivot:Row1Row2 20tx=40 12tx=0  Row22012 Row1Row2 20tx=40 0.4x=24  x=0.424=60 t=2040+x=2040+60=5  t=5 x=60=60 km



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