Problema Solution
An athlete can burn 9 calories per minute on a stationary
Bicycle and 11.5 calories per minute on a stair climber.
In a 30-minute workout an athlete burns 300 calories. How many minutes does the athlete spend on each type of exercise equipment?
Answer provided by our tutors
Let the time spent on the stationary bicycle be x minutes and that spent on stair climber be y minutes. Then according to the question:
9x + 11.5 y = 300 (1)
And the total time is 30 minute, so
x+y=30 (2)
Multiplying (2) with 9 we get
9x + 9y = 270 (3)
(1) - (3) gives
2.5y = 30
=> y = 30/2.5 = 12 minutes.
Putting this value of y in (2), we get x = 30-12 = 18 minutes