It would be 42 min. Because if 3/10 of her time is don't shooting and that takes up 18 min then if you divide by 3 to get how many minutes would be 1/10 of her practice you can then multiply that number by 7 because there are 7 of those sections done for shooting. 18 divided by 3 is 6 and 6 times 7 equals 42. So the answer is 42