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On the freeway, if a car with a length of 4 meters and a speed of 110 km / h is ready to overtake a truck with a length of 12 meters and a speed of 100 km / h, it will take about () A. 1.6 seconds B. 4.32 seconds C. 5.76 seconds D. 345.6 seconds
Suppose that the required time is x seconds, 110 km / h = 2759 M / s, 100 km / h = 2509 M / s. according to the distance that the car takes is equal to the distance that the truck takes plus the body length of the two cars, the solution is: 2759x − 2509x = 12 + 4, x = 5.76, so choose C
On a map with a scale of 1:200000, the distance between a and B is 20 cm. On another map, the distance between a and B is 8 cm
What is the scale of the other map
20*200000=4000000cm
Scale: 8:4000000 = 1:500000
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