A car from a to B, the first hour of the whole line of 25%, the second hour of the whole line of 30%, two hours a total of 220 kilometers, a and B total length of how many kilometers?

A: the total length of a and B is 400 km

A car from a to B, the first hour of travel 25%, the second hour of travel 50 kilometers, two hours a total of 45% of the journey?

A: the distance between a and B is 250 km

A car from a to B, the first hour of travel 25%, the second hour of travel 50 kilometers, two hours a total of 45% of the journey?

A: the distance between a and B is 250 km

From the first place to the second place, it took eight hours for the bus to drive, two hours more for the truck than for the bus, and the speed of the bus was faster than that of the train ()

1/8-1/(8+2)=1/40
The speed of the bus is 1 / 40 faster than that of the train

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