# 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 result:

x =  60 km

#### Solution:

x = 12 t
x = 20(t-2)

x = 12•t
x = 20•(t-2)

12t-x = 0
20t-x = 40

t = 5
x = 60

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