A car travels at an average speed of 68 miles per hour. How long does it take to travel 255 miles?

Afamily has five members. a mom, a dad, two sisters, & a brother. the family lines up single file. what is the probabillity that the mom is at the front of the line

Acircle has a circumference of 7.850 units. what is its radius?

Two airplanes start at the same place and travel in opposite directions, one at 395 miles per hour and the other at 422 miles per hour. how many hours will it take for the planes to be 2451 miles apart?