Question 63435
The north moving plane travels at 150 mile per hour so it travels 300 miles in two hours.
The west moving plane travels at 200 mile per hour so it travels 400 miles in two hours.
A diagram showing these distance and directions is a right angle triangle so the Pythagorean Theorem may be used.
{{{c^2=a^2+b^2}}}
{{{c^2=300^2+400^2}}}
{{{c^2=90000+160000}}}
{{{c^2=250000}}}
Find the square root of each side gives c=500
So the two planes will be 500 miles apart at 3pm