Steve can run 3.5 miles in 30 minutes. if steve increases his rate by 1/2 mile per hour, how far will he run in 2 hours?

show how to do this

15 miles

Step-by-step explanation:

Steve runs 3.5 miles in 30 minutes (0.5 hours).  So his speed is:

r = 3.5 mi / 0.5 h

r = 7 mi/h

If his rate increases to 7.5 mi/h, the distance he runs in 2 hours is:

d = 7.5 mi/h × 2 h

d = 15 mi

i assume that by 5 you mean 5 gallons.

(20)(0.25) = 15

removing 15 gallons reduces the tank from 20 to 5.