The length of the fast and slow trains are 150 meters and 200 meters respectively. They run on parallel tracks. If it takes 6 seconds for people on the slow train to see the fast train passing the window, what is the time for people on the fast train to see the slow train passing the window______ Seconds

The length of the fast and slow trains are 150 meters and 200 meters respectively. They run on parallel tracks. If it takes 6 seconds for people on the slow train to see the fast train passing the window, what is the time for people on the fast train to see the slow train passing the window______ Seconds

Suppose that it takes x seconds for a person on an express train to see the slow train passing through the window. 1506 = 200X, the solution is x = 8. It is tested that x = 8 is the solution of the original fractional equation, so the answer is 8

If we watch the lunar phase on the evening of the seventh day of the lunar calendar, when and where should we choose to observe it?
Choose A. eastern sky in the first half of the night B. western sky in the first half of the night C. eastern sky in the second half of the night D. western sky in the second half of the night

As for the phase of the moon, you only need to remember: "up West West West, down east east." first quarter moon: the first quarter moon comes out in the middle of the night, in the west, the moon faces west. Second quarter moon: opposite to the first quarter moon ~ on the first day of every month in the lunar calendar, when the moon moves between the sun and the earth, the moon faces the earth with its dark side, and rises with the sun

If we watch the phase of the moon on the night of the seventh day of the lunar calendar, we should choose when and where to observe it
A. The eastern sky in the first half of the night
B. The western sky in the first half of the night
C. The eastern sky in the middle of the night

Choose B
On the seventh day of the lunar calendar, the moon appears in the southern sky just after the sun sets