MHB How long will it take for the jets to be 9128 miles apart?

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Two jets leave an airport at the same time, flying in opposite directions. The first jet is traveling at three hundred seventy-seven mph and the other at two hundred seventy-five mph. How long will it take for the jets to be 9128 miles apart?

My Effort:

Jet 1:

rate = 377 mph

time = x

Distance = 9128 miles

Jet 2:

rate = 275 mph

time = x

Distance = 9128 miles

Equation:

377x + 275x = 9128

Is this correct?
 
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yes ... I would have used $t$ for time instead of $x$
 
It feels so good to get it right. Ok. I got it. Let t replace x for time.
 

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