Two trains

Two trains departed from City A and City B against each other. They met after some time. The first train took 9 hours to reach city B, and the second took 4 hours to reach city A. In what proportion were the train speeds?

Correct answer:

r =  2:3

Step-by-step explanation:

 r = v1:v2  s = s1+s2  s1 = v1   t s2 = v2   t  s2 = 9v1 s1 = 4v2  4v2 = v1 t 9v1 = v2 t   4v29v1 = v1v2  4v229v12 = 1  v22v12 = 94  v2v1 2 = 94  v2v1 = 94 = 32  r =  v2v1 r=2:3=320.6667

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