At 8 pm, a cyclist from A to B with speed 12km / h. Moments later the 2nd person goes from A to B with the operation speed of 20km / h. Count the two will meet at B. The 2nd traveled halfway AB, increase speed up to 24km / h. So two people meet by B 4 km.Hoi two met at some time?
đang được dịch, vui lòng đợi..
