一辆汽车每小时行驶45千米，是一辆自行车时速的3倍。自行车每小时行驶多少千米？4|(c1A.V'x(V'O
算式：提示7M2]:[2Q-r5C4|(c1A.V'x(V'O
答案：自行车每小时行驶9H,I2{+O,b6g/B1O+D0t3I0R1d+E(K:r7x千米4|(c1A.V'x(V'O