Answer:
Total calories = 45 calories
Step-by-step explanation:
Given data:
intensity of oxygen per minute = 1.5 lt
mechanical efficiency = 20%
time = 30 minutes
1 litre of oxygen = 5 calories per minutes
Total calories = oxygen quantity/min * time* efficiency* cal/min
Total calories = 1.5*30*0.20*5
Total calories = 45 calories