Final answer:
The lower bounds between Violet and Wilfred's times are 35 seconds and 38 seconds respectively.
Step-by-step explanation:
To find the lower bound between Violet and Wilfred's times, we need to consider the times rounded down. Since Violet took 36 seconds and Wilfred took 39 seconds, the lower bound for Violet's time would be 35 seconds and the lower bound for Wilfred's time would be 38 seconds.