Final answer:
The flash drive is already full, so it would not take any additional time for it to be completely full.
Step-by-step explanation:
In order to determine how long it would take for the flash drive to be completely full, you need to calculate the remaining space in the drive and divide it by the rate of data transfer. Let's do the math.
The flash drive can hold up to 100 megabytes. If there is already 140 megabytes in it, then there is 100 - 140 = -40 megabytes of space remaining. Since the drive is already full, it would not take any additional time for it to be completely full. There is no space left for more data to be transferred.