A pilot planning to fly at 420 miles per hour flies against a wind which cuts the speed to 4/5 of the planned speed. How long will it take the plane to travel 840 miles?

If the measure of xyz is 81 what is the measure of yz

Identify the converse of the following conditional: if a point is in the first quadrant, then its coordinates are positive. if the coordinates of a point are not positive, then the point is not in the first quadrant. if the coordinates of a point are positive, then the point is in the first quadrant. if a point is in the first quadrant, then its coordinates are positive. if a point is not in the first quadrant, then the coordinates of the point are not positive.

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?