[مالي بالدنيا سواك]

أرجو مساعدتي في حل هذي الاسئله..
الفصل الرابع..
سؤال 7 و13 و 21 و60

سؤال7..
A train at a constant 60.0 km\h moves east for 40.0 min,then in a direction 50.0ْ east of due north for 20.0 min, and then west for 50.0 min. What are the (a) magnitude and (b) angle of its average velocity during this trip?? ssm