Motion 2

At 10 o'clock started from place A car speed at 90 km/h. 20 minutes after started from the place B at speed 60 km/h another car. Distance places A and B is 120 kilometers. What time and where they meet?

Result

t = 10:56 hod Wrong answer
x =  84 km

Solution:


90(t-10)+60(t-(10+20/60))=120
x =90(t-10)

90•(t-10)+60•(t-(10+20/60))=120
x =90•(t-10)

9000t = 98400
90t-x = 900

t = 16415 ≈ 10.933333
x = 84

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