A cruise ship is traveling at a rate of 20 miles per hour. Use a direct variation formula to calculate the number of miles traveled in 7 hours.?

To calculate the number of miles traveled by the cruise ship, you can use the direct variation formula ( d = rt ), where ( d ) is the distance, ( r ) is the rate, and ( t ) is the time. Here, the rate ( r ) is 20 miles per hour and the time ( t ) is 7 hours. Plugging in the values, ( d = 20 \times 7 = 140 ) miles. Therefore, the cruise ship travels 140 miles in 7 hours.