$\"\"$

Two airliners are $\"\"$ a part and heading toward each other at different altitudes.

The first plane is travelling north at $\"\"$ .

Second plane is traveling south at $\"\"$ .

Draw a diagram planes are tarvelling by north and south.

$\"\"$

Let time is $\"\"$ both are travels same time.

Where $\"\"$ is number of hours untill the planes travelling distance.

$\"\"$

Find time $\"\"$ .

Distance formula: $\"\"$ .

Let time is number of hours untill they travelling distance.

Make a table:

\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \

$\"\"$

Solve the equation.

Distance travelled by first plane plus Distance travelled by second plane equals $\"\"$

$\"\"$

$\"\"$ (Original equation)

$\"\"$ (Simplify)

$\"\"$ (Divide each side by $\"\"$ )

$\"\"$ (Simplify)

Therefore, the two planes are travelling $\"\"$ apart after $\"\"$ .

$\"\"$

The two planes are travelling $\"\"$ apart after $\"\"$ .