Final answer:
The train will travel 462 feet in 3 seconds.
Step-by-step explanation:
To find the distance traveled by the train in 3 seconds, we need to convert the train's speed from miles per hour to feet per second. Since 1 mile is equal to 5280 feet, we can calculate the train's speed in feet per second by multiplying its speed in miles per hour by 5280/3600 (since there are 3600 seconds in an hour).
So, the train's speed in feet per second is: 105 miles/hour * 5280 feet/mile * 1/3600 hour/second = 154 feet/second.
Now, we can find the distance traveled by the train in 3 seconds by multiplying its speed in feet per second by the time in seconds: 154 feet/second * 3 seconds = 462 feet.