問題:::: A train is moving with a speed of 45 km an hour. What are the speeds relative to this train of others moving in the same direction at 62km an hour and at 27 km an hour; also of one at rest?
我想問佢依條問題..想問咩?
同要計算過程.....(冇既話..咁就唔要..)
更新1:
最重要..我想問..... speeds relative 係咩? 可吾可解釋一下..?