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Two math test questions in junior high school. Urgent solution!
One: the speed of B is 90% of that of A.

The speed of C is 90% of that of B.

So the speed of C is 90% × 90% of A = 81%.

That is to say, A arrives 19m earlier than C.

Two: the relative speed of two cars is150m/6s = 25m/s.

It takes 200/25=8s for the local train to pass through the express train.