Final answer:
To cross the Great Seto Bridge at a walking speed of 4 mi/h, it would take approximately 2.35 hours, so the closest answer is 2.4 hours.
Step-by-step explanation:
To determine how long it would take to cross the Great Seto Bridge in Japan by walking at a speed of 4 miles per hour (mi/h), we will need to know the length of the bridge. The Great Seto Bridge, also known as the Seto Ohashi Bridge, has a total length of approximately 9.4 miles (15.1 kilometers) when combining all of its multiple bridges and viaducts. To calculate the time it would take to cross, we use the formula time = distance ÷ speed.
Let's perform the calculation:
- Distance to cross the bridge = 9.4 miles
- Walking speed = 4 mi/h
- Time to cross = Distance ÷ Speed = 9.4 mi ÷ 4 mi/h
- Time to cross = 2.35 hours
Since 0.35 hours is 21 minutes (0.35 x 60 minutes), the approximate time is 2 hours and 21 minutes. Hence, the closest answer from the given options is (b) Approximately 2.4 hours.