Question

[udifiuaify]

mot xe lua va mot o to chay nguoc chieu nhau tren 2 con duong sat song song .xe lua dai 150 m , o to dai 60 m .tinh thoi gian tu luc 2 dau xe gap nhau cho den luc 2 toa cuoi cung roi nhau biet v xe lua la 54 km /h, v cua o to la 72km/h