Kilometers 4391

The car moved out of place at a speed of 60 km/h in 1.5 hours. The second car moved at a speed of 80 km/h. How long will it take to catch the first car, and how many kilometers will it drive?

Correct answer:

t =  4.5 h
s =  360 km

Step-by-step explanation:


s = 60(t+1.5)
s = 80t

s = 60·(t+1.5)
s = 80·t

s-60t = 90
s-80t = 0

Row 2 - Row 1 → Row 2
s-60t = 90
-20t = -90


t = -90/-20 = 4.5
s = 90+60t = 90+60 · 4.5 = 360

s = 360
t = 9/2 = 4.5

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