I've found the missing details of this task, so I can help you out:
First: keep in mind that the value of vertical motion does not depend on horizontal motion. The task asks you to figure<span> the amount of time for a drop of water to fall 1 meter from Isabella's hand and check whether this time is enough for the water to reach the boy.
Solution for vertical motion: </span>

For horizontal motion:
Now you can see that this amount of time is not enough.
Answer:
"It is an honour that I hadn't thought about."
My apologies if I had gotten it wrong, I hope this helps you
C
the comma separates the two clauses