Four students did a 400 meter sprint relay. henry's time was 51.10 seconds, cathryn's time was 45.26 seconds, grayson's time was 101.92 seconds, and woody's time was 62.14 seconds. what was their total time?

Hi my sisters and brothers can tell me the answer because i don’t understand the question

The area of a rectangle is 54x^9y^8 square yards.if the length of the rectangle is 6x^3y^4 yards,which expression represents the width of the rectangle in yards

You can ride your bike around your block 6 times and the whole neighborhood 5 times in 16 minutes. you can ride your bike around your block 3 times and the whole neighborhood 10 times in 23 minutes. how long does it take you to ride around the neighborhood?