Antonio burns about 3 calories/min walking on a treadmill. He burns about 5 calories/min riding on a stationary bike. His goal is to burn 250 calories during his workout. Let t represent the number of

Antonio burns about 3 calories/min walking on a treadmill. He burns about 5 calories/min riding on a stationary bike. His goal is to burn 250 calories during his workout. Let t represent the number of minutes on the treadmill and let b represent the number of minutes on the bike. Which equation models this relationship?

a) 3t + 5b = 250

b) 5b−3t=2505b−3t=250

c) 3t−5b=2503t−5b=250

d) 3b + 5t = 250