When the car completes half of the whole journey, the big car is 48 kilometers away from A. when the car arrives at B, the big car just completes four fifths of the whole journey. How many kilometers are there between a and B?

48 * 2 = 96 km
96 divided by 4 / 5 = 120 km

A car from a to B, three hours 240 kilometers. At this speed, another 2.5 hours, there are 5 kilometers from B, how many kilometers between a and B?

The distance between a and B is x km
3∶240=（3+2.5）∶（x-5)
3x-15=240×5.5
x=80×5.5+5
x=445
The distance between a and B is 445 km
I hope it can help you,

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