Current location - Training Enrollment Network - Mathematics courses - This math problem is very difficult. How soon can Xiao Xin catch up with Xiaoming?
This math problem is very difficult. How soon can Xiao Xin catch up with Xiaoming?
(1)0.4×2=0.8 (hours) 3.4-0.8=2.6 (hours) 2.6× 2 = 5.2 (kilometers) 5.2-1.8-1.7-/kloc-0. The distance between rooms D is x (1.7+1.8+x+1.1)/2+0.4 * 2 = 3.4 (4.6+x))/2+0.4 * 2 = 3.