Final answer:
To find how far the Phun Family's shore house is from their starting point, multiply their speed of 40 miles per hour by the time traveled, 3.5 hours, which equals 140 miles.
Step-by-step explanation:
To calculate how far the Phun Family's house is from their starting point, you need to use the formula for distance which is Distance = Speed × Time. In this case, their speed was 40 miles per hour, and they drove for 3.5 hours (3 hours and 30 minutes).
To find the distance, multiply the speed by the time:
Distance = 40 miles/hour × 3.5 hours
Therefore, their shore house is 140 miles away from their starting point.