Sean runs 3 miles in 21 minutes , gwen runs 4 miles in 32 minutes ,marc runs 5 miles in 30 minutes. who has the fastest average speed, in miles per minute?

Ageologist had two rocks on a scale that weighed 4.6 kilograms together. rock a was 0.5 of the total weight. how much did rock a weigh?

Twenty points. suppose that one doll house uses the 1 inch scale, meaning that 1 inch on the doll house corresponds to 1/2 foot for life-sized objects. if the doll house is 108 inches wide, what is the width of the full-sized house that it's modeled after? in inches and feet

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.