Final answer:
Tilda and Nolan spent a total of $180$ days away from their homes.
Step-by-step explanation:
The phrase "tilda and nolan wendt their homes for 90" suggests that both Tilda and Nolan were away from their homes for the same duration, which is $90$ days.
To find the total duration both were away, we sum up their times:
90+90=180
Tilda" s duratin+Nolan ′ s duration=90+90=180 days.