Joshua wants to burn at least 400 calories per day, but no more than 600. He does this by walking and playing basketball. Assuming he burns 4 calories per minute walking, w, and 5 calories per minute spent playing basketball, b, the situation can be modeled using these inequalities: 4w + 5b ≥ 400 4w + 5b ≤ 600 Which are possible solutions for the number of minutes Joshua can participate in each activity? Check all that apply.
40 minutes walking,
 40 minutes basketball 60 minutes walking,
 20 minutes basketball 20 minutes walking,
 60 minutes basketball 50 minutes walking,
50 minutes basketball 60 minutes walking,
80 minutes basketball 70 minutes walking,
60 minutes basketball