In a drill, Mark gives Fred a 45 meter head start. After t seconds, Fred is a distance 5t + 45 from the starting line and Mark is a distance of 6t from the starting line. How far ahead of Mark is Fred after t seconds?
Perimeter:

Volume is length times width times height so
20 times 8 times 30 which is 4,800
surface area is ph (p is perimeter of base), h is height.
so perimeter would be length+length+width+width so 20+20+8+8 which is 56. so multiply 56 times 30 which is 1680. hope this !

Could you provide a photo?