can someone help me figure these ones

i know the answers but how do you get them?

#3 It costs $1 per sqaure yard to waterproof canvas. What will it cost to waterproof a canvas truck cover that is 15'x 24'? answer; $40

#4 A part time employee worked a total of 16 1/2 hours during 5 days of the past week. What was this employee's average workday? answer 3 hrs and 18 mins

#6 After an article is discounted at 25% it sells for $112.50. The original price of the article was? answer 150.00

#7 A plane left new york at 3:30 p.m. est and arrived in los angelas at 4:15 p.m. Pst. How long did the flight take?
I usually get these kinds of questions but with the time changes i don't get it. answer 3 hrs and 15 mins

#3 It costs $1 per sqaure yard to waterproof canvas. What will it cost to waterproof a canvas truck cover that is 15'x 24'? answer; $40

Area = 15' x 24' = ?? square feet.
Convert square feet to square yards knowing there are 9 square feet in 1 square yard. Then # square yards x $1 per square yard = total cost.

#4 A part time employee worked a total of 16 1/2 hours during 5 days of the past week. What was this employee's average workday? answer 3 hrs and 18 mins

16.5 hours/5 days = average hours/day. = 3.3 hours. or the 0.3 can converted to minutes by 60 min/hr x 0.3 hr = 18 minutes.

#6 After an article is discounted at 25% it sells for $112.50. The original price of the article was? answer 150.00

cost - 0.25 x cost = 112.50
cost and 1 x cost are the same so re can rewrite it as
1 x cost - 0.25 x cost = 112.50
0.75 x cost = 112.50
cost = 112.50/0.75 = ??

#7 A plane left new york at 3:30 p.m. est and arrived in los angelas at 4:15 p.m. Pst. How long did the flight take?
I usually get these kinds of questions but with the time changes i don't get it. answer 3 hrs and 15 mins

The time difference between NY and LA is 3 hours. So take the difference between 3:30 and 4:15 = :45 or 45 minutes. So the flight took 3 hours and 45 minutes. Check my thinking. I believe the answer of 3 hours and 15 minutes is not correct.

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