a silver wire 2.6 mm in diameter transfers a charge of 420 c in 80 min. silver contains 5.8×1028 free electrons per cubic meter.

When amy exercises in her fitness center for 1 hr she burns a total of 475 calories.if she burns 9 calories a minute jogging on the treadmill and then burns 6.5 calories a minute pedaling on the stationary bicycle how many minutes of the hour does she spend exercising on the bicycle?