Answer:
310 minutes
Step-by-step explanation:
1. Find the minutes Marta exercises in a month that has 31 days if she exercises 30 minutes each day:
[tex]31days*\frac{30minutres}{1day}=930minutes[/tex]
Martha exercises 930 minutes in a month.
2. Find the minutres Greg exercises in a month that has 31 days if he exercises 40 minutes each day:
[tex]31days*\frac{40minutes}{1day}=1240minutes[/tex]
Greg exercises 1240 minutes in a month.
3. Calculate how many more minutes Greg does exercise than Marta:
1240 - 930 = 310 minutes
