Question: Dsolve---finding a time value for a specific variable

Okay, so I think this is simple, but I cannot find the command.

 

I get a numeric solution for a system of ODEs, with variables a function of t. Now, I know I can use the sol(t) command to give me the values of my variables at specific values of t. But, how do I get the values of t for specific variable values. There has to be a more efficient way than just plugging in values for t until I come to the answer.

Thanks!

 

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