题:一艘航空母舰停在港口,用超声波搜寻海底,发现有一艘潜艇向已方驶来(假设为匀速直线运动),第一次发射超声波18秒后收到回波,收到回波286秒后发射第二次超声波,又经10秒后收到回波,求潜水艇航行的速度多大?(超声波在海水中的平均速度为1500米/秒)错解:母舰第一次接收到超声波时,潜艇距 Problem: An aircraft carrier stopped at the port and used ultrasound to search the seabed. It was discovered that a submarine approached the square (assuming uniform linear motion). The first ultrasonic wave was transmitted after 18 seconds and received an echo. The echo was received 286 seconds. After launching the second ultrasound and receiving an echo after 10 seconds, how fast is the submarine sailing? (The average speed of the ultrasonic wave in seawater is 1500 meters/second.) Misunderstanding: The mother ship received ultrasound for the first time. Submarine distance