The density of a mixture of 1.5m3 of water and 0.5m3 of alcohol of density 800 kgm–3 is:

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?