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

[mathdad]

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?

 

[skeeter]

yes ... I would have used $t$ for time instead of $x$

 

[mathdad]

It feels so good to get it right. Ok. I got it. Let t replace x for time.