应该是9时吧
设用x时,那么回来是9-x时.
1500x=1200X(9-x)————————————因为回来和去路程一样
1500x=1200X9-1200Xx————————————用乘法分配律
1500x=10800-1200x
1500x+1200x=10800
2700x=10800
x=4
4X1500=6000(km)
应该是9时吧
设用x时,那么回来是9-x时.
1500x=1200X(9-x)————————————因为回来和去路程一样
1500x=1200X9-1200Xx————————————用乘法分配律
1500x=10800-1200x
1500x+1200x=10800
2700x=10800
x=4
4X1500=6000(km)