兰兰家距离外婆家252千米,长途汽车每小时行驶42千米。坐长途汽车从兰兰家到外婆家需要几小时才能到达?3I6N5D4o*u2I;P;A'?/s:F9f
算式:提示(\6[*x/P,t5V9p3V:M(?0e6g3I6N5D4o*u2I;P;A'?/s:F9f
答:需要(m1q6v9z+R:m0Y;|1z.F8p小时才能到达.3I6N5D4o*u2I;P;A'?/s:F9f