Car Z travels at speed z miles per hour, and Car Y travels at speed y

Car Z travels at speed z miles per hour, and Car Y travels at speed y miles per hour, and z > y. On one day, the two cars are parked at mile zero on a straight road, and they begin moving at the same time in the same direction. After 2 hours 30 minutes, the distance between the cars is 25 miles. On another day, the cars are parked 25 miles apart on the same road, and they begin moving at the same time toward each other. In 30 minutes, the cars pass each other.

Select the cars' speeds y and z such that they are jointly compatible with the given information. Make only two selections, one in each column.

y	z
		10
		20
		30
		40
		50
		60