Application problems and answers of self-test questions at the end of sixth grade mathematics in primary school

Because the speed ratio is inversely proportional to time, car A is slower than car B, and the speed is 6/8 = 3/4.

So car A and car B set off at the same time and then met, and the distance ratio was 3/4.

We also know that when we met, the distance from B was 240 kilometers, and the bus B started from B, so we knew that the bus B had traveled 240 kilometers, so the bus A took 180 kilometers, so we knew that the total distance was 420 kilometers.

Then the speed of the second car is distance ÷ time =420÷6= 70 kilometers per hour.

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