甲、乙两地相距788千米,货车从甲地出发开往乙地,每小时行56千米,1.5小时后,从乙地往甲地开出一辆客车,每小时行72千米,客车开出几小时后与货车相遇?

问题描述:

甲、乙两地相距788千米,货车从甲地出发开往乙地,每小时行56千米,1.5小时后,从乙地往甲地开出一辆客车,每小时行72千米,客车开出几小时后与货车相遇?

(788-1.5x56)/(56+72)=5.5
答案是5.5时

(788-1.5x56)除以(56+72)= 剩下自己算

(788-1.5x56)除以(56+72)=5.5

(788-1.5x56)/(56+72)=5.5

(788-56*1.5)/(56+72)
=(788-84)/128
=704/128
=5.5(小时)
答:客车开出5.5小时与货车相遇.