equations like this can be mistaken for seeming "too hard" because of the brackets vut its really not. just break down the steps and you'll be off and going to Harvard LoL
15 Consider a car is travelling for one hour. Which of the following trips have the same average velocity? A. car travels 20 km due east and car travels 70 km due east B. car travels 40 km due east, then turns around and travels 20 km due west and car travels 20 km due east C. car travels 70 km due east and car travels 40 km due east, then turns around and travels 20 km due west D. car travels 30 km due west, then turns around and travels 30 km due east and car travels 40 km due east, then turns around and travels 20 km due west