A = 2x3xx，b = 2x5xx。 The greatest common factor of A and B is (2x), in which case the greatest common factor is 14. X=(7), when the least common multiple of A and B is (2 10). A city to b city ***204.7 kilometers. A car drove for 2.7 hours in the morning and 1.9 hours in the afternoon. It is 35.6 kilometers less in the morning than in the afternoon. How many kilometers does this car average per hour? 204.7÷ (1.9+2.7) = 44.5 (km) The total length of expressways in A and B is 274 km. A car goes from city A to city B. The first 1.2 hour is 22km less than the last 1.6 hour. What's the speed of this car? 274÷ (1.2+1.6) ≈ 7.86 (km) Xiaoming and Xiaogang do morning exercises and run. Xiaoming runs 6 meters per second and Xiaogang runs 8 meters per second. Q: Xiaoming is in front of Xiaogang 14 meters. How many seconds after they set off in the same direction at the same time, Xiao Gang caught up with Xiao Ming? 14÷(8-6)=7 (seconds) 2. The two started at the same time at a distance of 77 meters. After a few seconds, they are 7 meters apart. 7÷(8-6)=3.5 seconds Xiaoming and Xiaogang practice running on a 280-meter circular road. Xiao Ming is 6m/s and Xiao Gang is 8m/s. Q: They both start from the same point and the same direction at the same time. After a few seconds, Xiao Gang ran one more lap than Xiao Ming. 280÷(8-6)= 140 sec 2, both of which start from the low point of the unified point in the opposite direction. A few seconds later, the two met for the second time. 280÷(8+6)=20 seconds. I hope my answer is helpful to you.

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