How would I solve this​

Wo competing gyms each offer childcare while paretnts work out. gym a charges $9.00 per hour of childcare. gym b charges $0.75 per 5 minutes of childcare. which comparison of the childcare costs is accurate? gym b charges $1.05 less per hour than gym a. gym b charges $1.50 less per hour than gym a. gym b charges $5.25 less per hour than gym a. gym b and gym a charge the same hourly rate for childcare.