In order to lose one pound, one must burn off about 3,500 calories. to burn off 100 calories, you must bicycle at 9 mph for 15 minutes. how long do you have to bicycle at 9mph to lose 3 pounds?

The base of pyramid a is a rectangle with a length of 10 meters and a width of 20 meters. the base of pyramid b is a square with 10-meter sides. the heights of the pyramids are the same. the volume of pyramid a is the volume of pyramid b. if the height of pyramid b increases to twice that of pyramid a, the new volume of pyramid b is the volume of pyramid a.