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)

9000t = 98400
-90t+x = -900

t = 164/15 ≈ 10.933333
x = 84

Calculated by our linear equations calculator.







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To solve this example are needed these knowledge from mathematics:

Do you want to convert length units?

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