A. B is 64 kilometers away from each other. A and B ride bicycles from a and B respectively. B travels 4 kilometers more per hour than A. if a goes 40 minutes ahead of B, the distance they travel when they meet is exactly the same. What are the speeds of a and B?

A. B is 64 kilometers away from each other. A and B ride bicycles from a and B respectively. B travels 4 kilometers more per hour than A. if a goes 40 minutes ahead of B, the distance they travel when they meet is exactly the same. What are the speeds of a and B?

Suppose B's speed is x kilometers per hour, then a's speed is (x + 4) kilometers per hour. According to the meaning of the question, 32x-32x + 4 = 4060, sorting out, X2 + 4x-192 = 0, the solution is: X1 = 12, X2 = - 16. The test shows that X1 = 12, X2 = - 16 are the solutions of the original equation, but x = - 16 is not in line with the meaning of the question. The solution of the original equation is x = 12 The speed of the car is 16 kilometers per hour