The highway from Xi'an to Hanzhong is about 288 kilometers long. The two cars leave each other from the two places. Three hours later, the distance is 18 kilometers. If car a travels 48 kilometers per hour, how many kilometers does car B travel per hour

The highway from Xi'an to Hanzhong is about 288 kilometers long. The two cars leave each other from the two places. Three hours later, the distance is 18 kilometers. If car a travels 48 kilometers per hour, how many kilometers does car B travel per hour

（288-18）÷3-48
=270÷3-48
=90-48
=42km
Car B travels 42 kilometers per hour
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There are two cars a and B on the straight road. Car a starts to make uniform acceleration straight-line movement from static to catch up with car B moving at a speed of 6 meters per second 40 meters ahead. If it is known that car a's uniform acceleration is 2 meters per second
Time and speed for car a to catch up with car B

1 / 2 * 2 * t * t = 40 + 6T; t = 10 seconds, speed = 2 * 10 = 20

A and B vehicles pass through the same displacement along the straight road. A vehicle moves at the speed of V a 1 = 40 km / h in the first half of the displacement and V a 2 = 60 km / h in the second half of the displacement. B vehicle moves at the speed of V B 1 = 40 km / h in the first half of the displacement and V B 2 = 60 km / h in the second half of the displacement （　　）
A. V a =. V b.. V a ＞. V B C.. V a ＜. V b D. cannot be determined

The average speed of car a in the whole journey. V A = x x 2V a 1 + X 2V a 2 = 2V a 1V a 2V a 1 + V a 2 = 2 × 40 × 6040 + 60km / h = 48km / h. The average speed of car B in the whole journey. V b = v b 1t 2 + V B 2T = v b 1 + V B 22 = 40 + 602km / S = 50km / h. It can be seen that. V a ＜. V B. So C is correct, and a, B and D are wrong

When car a and car B pass through the same displacement along the straight road, car a moves at the speed of V1 = 40km / h in the first half of the displacement and V2 = 60km / h in the second half of the displacement; car B moves at the speed of V1 = 40km / h in the first half and V2 = 60km / h in the second half of the displacement, the relationship between the average speed of car a and car B in the whole displacement is ()
A. V a = V B. v a ＞ V B C. v a ＜ v b D

V a = x 2v1 + X 2v2 = 48km / h. v b = V 1t 2 + V 2T = 50km / h. so v a < V B. so a, B and D are wrong, C is right. So C is chosen