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 v2v12=94 v2v1=94=32  r=v2v1 r=2:3=320.6667



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