Which pair of sentences is describing the same velocity? A.
A car is parked. A car is moving in circles.
B.
A bus drives 40 miles per hour north. A truck drives 50 miles per hour north.
C.
A boy walks east at 6 kilometers per hour. A girl walks west at the same speed as the boy.
D.
Valerie rides her bike south at 8 kilometers per hour. Owen jogs south at 8 kilometers per hour.

Idon’t quite understand this problem

Why is it important always to use horizontal bars in unit fractions when performing unit conversions?

The bubba chump shrimp company processes and packages shrimp for sale to wholesale seafood distributors. the shrimp are transported to the main plant by trucks that carry 1,000 pounds (lb) of shrimp. once the continuous flow processing of the shrimp begins, no inventory is allowed in buffers due to spoilage and all of the shrimp must be processed within 12 hours to prevent spoilage. the processing begins at the sorter, where the trucks dump the shrimp onto a conveyor belt that feeds into the sorter, which can sort up to 500 lb per hour. the shrimp then proceed to the desheller, which can process shrimp at the rate of 400 lb per hour. however, after 3 hours and 45 minutes of processing, the desheller must be stopped for 15 minutes to clean out empty shrimp shells that have accumulated. the veins of the shrimp are then removed in the deveining area at a maximum rate of 360 lb per hour. the shrimp proceed to the washing area, where they are processed at 750 lb per hour. finally, the shrimp are packaged and frozen. what is the daily process capacity of the processing plant (excluding the packaging and freezing)?