Final answer:
The second jet was 445 km/h faster than the first jet, which can be determined by subtracting the speed of the first jet from the second jet's speed.
Step-by-step explanation:
The question asks how much faster the second jet is compared to the first one. To find out, we subtract the speed of the first jet from the second jet's speed. So, doing the calculation:
Speed of second jet: 1230 km/h
Speed of first jet: 785 km/h
Speed difference = 1230 km/h - 785 km/h
Speed difference = 445 km/h
Therefore, the second jet was 445 km/h faster than the first one. The correct answer is option B.