I think it would be 2 and a half hours/ 2 hours and 30 minutes.

Solution:
Given expression is 
To find the inverse of y.
⇒ 
Do cross multiplication.
⇒ y = –6 × 3
⇒ y = –18
Inverse of y means reverse the function.
We know that inverse of y is
.
⇒ 
Hence, inverse of y is 
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Answer:
common difference is 4
Step-by-step explanation:
12-4=8
8-4=4