Final answer:
Jeff is shooting 1 basket every 3 seconds, and Jennifer is shooting 1 basket every 6 seconds.
Step-by-step explanation:
Jeff is shooting baskets at a rate of 28 baskets in 84 seconds, which simplifies to a speed of 1 basket every 3 seconds. To find this, divide the number of baskets by the number of seconds (28/84). Similarly, Jennifer is shooting baskets at a rate of 11 baskets in 66 seconds, which is equivalent to 1 basket every 6 seconds (11/66).