To find out how long Megan's gym class is, we first need to convert 7 1/2 hours into a decimal or fraction for easier calculation.
7 1/2 hours can be converted to an improper fraction: \[ 7 \frac{1}{2} = \frac{15}{2} \text{ hours} \]
Next, we calculate 1/10 of that time: \[ \text{Gym class time} = \frac{1}{10} \times \frac{15}{2} \]
Now, multiply the fractions: \[ \text{Gym class time} = \frac{15}{20} = \frac{3}{4} \text{ hours} \]
To convert this back into minutes, we multiply by 60 minutes per hour: \[ \frac{3}{4} \times 60 = 45 \text{ minutes} \]
So, Megan's gym class is 45 minutes long.