扬州到苏州的高速公路长180千米，一辆汽车4小时跑了一个来回。这辆汽车平均每小时行驶多少千米？:B/k0K2v9N0S-`3S4x6m;}+J.m
算式：提示/S-b.k6a(^-V0z-O1u+F,m2_'i0`:B/k0K2v9N0S-`3S4x6m;}+J.m
答：这辆汽车平均每小时行驶1G4a3s0V.?:o6|7e(U*d7e9P8`千米。:B/k0K2v9N0S-`3S4x6m;}+J.m