请解答上题---25. 货车和轿车分别沿同一路线从甲地出发去乙地, 已知货车先出发 10 分钟后，轿车才出发，当轿车追上货车 5 分钟后，轿车发生了故障，花了 20 分钟修好后，轿车按原来速度的 $\frac{9}{10}$ 继续前进，在整个行驶过程中，货车和轿车均保持各自的速度匀速前进，两车相距的路程 $y$ (米) 与货车出发的时间 $x$ (分钟) 之间的关系的部分图象如图所示。 **Extracted Content:** **Chart Description:** * **Type:** Line chart showing the distance between two vehicles over time. * **Coordinate Axes:** * X-axis: Labeled "x(分钟)" (x(minutes)), representing time. * Y-axis: Labeled "y(米)" (y(meters)), representing distance. The origin is labeled "O". * **Points:** * O: Origin (0, 0). * A: Approximately (10, 3000), labeled with a dotted line indicating y=2500 and x=10. It appears A is above the 2500 mark, but the dotted line points to x=10 and y=2500. Let's assume A corresponds to a time of 10 minutes and a distance of 2500 meters based on the dotted lines. * B: On the X-axis, labeled "B", corresponding to a time greater than 10. The distance between the vehicles is 0 at this point (meeting point). * C: Above the X-axis, labeled "C", corresponding to a time of 40 minutes (indicated near 45, slightly before it, and the label is "45D" below it, but C is clearly above 40 on the x-axis). It seems C is at time 40 minutes and a distance around 2500 meters (similar height to the 2500 dotted line). Let's use the dotted line to A which points to 2500. C is at time 40 minutes and distance 2500 meters based on aligning its height with the dotted line from A. * D: On the X-axis, labeled "D", corresponding to a time of 45 minutes (labeled below). The distance between the vehicles is 0 at this point (meeting point). * E: Above the X-axis, labeled "E", corresponding to a time between 45 minutes and 'a' minutes. It represents the maximum distance between the vehicles after the second meeting. * F: On the X-axis, labeled "F", corresponding to a time of 'a' minutes (labeled below). The distance between the vehicles is 0 at this point (meeting point). * **Lines:** * Line segment O-A: Sloping upwards from the origin. * Line segment A-B: Sloping downwards from A to the X-axis at B. * Line segment B-C: Sloping upwards from B to C. * Line segment C-D: Sloping downwards from C to the X-axis at D. * Line segment D-E: Sloping upwards from D to E. * Line segment E-F: Sloping downwards from E to the X-axis at F. * **Labels and Annotations:** "y(米)" (y(meters)), "x(分钟)" (x(minutes)), "O", "A", "B", "C", "D", "E", "F", "10", "2500", "45", "a". Dotted line from A to the x-axis at x=10 and to the y-axis at y=2500. Dotted line from C to the point (40, 0) on the x-axis and to the y-axis (aligned with 2500). The label '45D' is near D on the x-axis. **Textual Information:** (1) 货车的速度是_________ 米/分, 轿车故 障前的速度是_________ 米/分; (2) 求 $a$ 的值; (3) 求两车第三次相遇前, 货车出发多长 时间, 两车相距 14000 米.