The length of a and B buses are 150 meters and 200 meters respectively. They are running on parallel tracks. It is known that a passenger on car a has measured that the time for car B to pass outside his window is 10 seconds, so what is the time for the passenger on car B to see car a pass outside his window______ Seconds

The length of a and B buses are 150 meters and 200 meters respectively. They are running on parallel tracks. It is known that a passenger on car a has measured that the time for car B to pass outside his window is 10 seconds, so what is the time for the passenger on car B to see car a pass outside his window______ Seconds

Let's suppose that the time for the passenger of car B to see car a passing outside his window is x seconds. From the meaning of the question, there is 20010 = 150x, and the solution is x = 7.5. After testing, x = 7.5 is the solution of the original equation. That is to say, the time for the passenger of car B to see car a passing outside his window is 7.5 seconds

On the straight road in the South and north directions, there are two cars a and B driving. The people in car a see car B driving south, and the people in car B see the buildings on the roadside moving south. Their respective reference objects are ()
A. Car a, car B, car a, car C, car B, car D, car a

It is known from the title that the people on car B see the trees on the roadside moving southward, which means that car B drives northward with the ground as the reference. If the people on car a see that car B also moves southward, which means that both car a and car B drive northward relative to the ground, and the speed of car a is higher than that of car B, which means that car a is the reference, B car is also backward, that is south. So BCD error. So choose a

There are two stationary trains a and B in the railway station. When car a starts, the passenger in car B feels that he is retreating. At this time, he uses as a reference

Car a