Then when they meet, the distance traveled by the warship is (200+x) nautical miles.
The distance traveled by the supply ship is √[ 100? +( 100-x)？ ]
It is known that warships are twice as fast as supply ships and meet at the same time.
So: (200+x)/2=√[ 100? +( 100-x)？ ]
The unary quadratic equation about X can be obtained by solving the quadratic equations on both sides.