After 2 hours, B starts from the same place by bike and pursues a along the same road A. take aerobic exercise at the speed of 5 km / h. After 2 hours, a B starts from the same place by bicycle and pursues a along the same road. According to their agreement, B can catch up with a no earlier than 1 hour and no later than 1 hour and 15 minutes. Please set a speed for B and the speed is positive

After 2 hours, B starts from the same place by bike and pursues a along the same road A. take aerobic exercise at the speed of 5 km / h. After 2 hours, a B starts from the same place by bicycle and pursues a along the same road. According to their agreement, B can catch up with a no earlier than 1 hour and no later than 1 hour and 15 minutes. Please set a speed for B and the speed is positive

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Xiaoming runs at a speed of 5km / h. After 2h, Xiaohua starts from the same place by bike and chases Xiaoming along the same road. According to their agreement, Xiaohua can catch up with Xiaoming no earlier than 1h and no later than 1 & nbsp; H & nbsp; 15in?

Let Xiaohua's speed be X & nbsp; km / h, 1 & nbsp; H & nbsp; 15 & nbsp; min = 54H. According to the meaning of the question, (2 + 1) × 5x ≥ 1, (2 + 54) × 5x ≤ 54, the solution is 13 ≤ x ≤ 15. A: Xiaohua's speed should be controlled from 13 & nbsp; km / h to 15 & nbsp; km / h