150 miles in 3 hours;how many miles in 30 minutes?
my answer is 1.30
This time you're wrong.
We have two ways of solving this problem.
150/3 = 50 miles in 1 hour
1/2 * 50 = 25 miles in 30 minutes
OR
150/3 = x/0.5
Cross-multiply and solve for x.