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Jiaxiang math is too difficult.
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1, the sum of a and b is 389.4. If the decimal point of A is shifted one place to the right, it is equal to B, and A is (35.4).

Analysis:

Moving the decimal point of a number to the right by one place is magnified by 10 times, which is equal to the number B. Then the number B is 10 times of the number A, and 389.4 corresponds to the sum of multiples of A and B. Therefore, the number A is 389.4 ÷ (10+/kloc-0).

2. It took the bus five hours to go from A to B and four hours to return from B to A, and the speed when returning was (25)% faster than when going.

Analysis:

The speed is 1/5 when going, and 1/4 when returning.

( 1/4- 1/5)÷ 1/5=25%