敬請高手幫我做道選擇題,謝謝You are trying to fill a bath with both taps on,but have accidentally left out the plug.Normally the hot water tap takes 8 minutes to fill the bath and the cold water tap takes 10 minutes.However,the water empties out through the plug hole in 5 minutes.How long will it take for the bath to fill?A 10 minutes B 20 minutes C 30 minutes D 40 minutes
熱心網友
應該是D.設需要x分鐘。(1/8+1/10-1/5)x=1(5/40+4/40-8/40)x=11/40x=1x=1*40/1x=40
熱心網友
D.40 minutes 1/(1/8+1/10-1/5)=40很明顯的數學題.小學生都能算的,譯為漢語后很清楚的.熱水管8分鐘注滿,冷水管10分鐘注滿.同時加水(with two taps on),下水管放水5分鐘.問幾分鐘能注滿?
熱心網友
數學題,給浴缸放水,冷熱水同時放,但忘了堵上下水道。所以放出的水一直在往外流。已知熱水管放滿整缸水需要8分鐘,冷水管放滿整缸水需要10分鐘。而整缸水只需5分鐘就會從下水道流個干干凈凈。問將浴缸放滿需要多長時間?我的數學不夠好。 555。做不出來。