Hi Christopher!
If the train travels 20 feet in 1/5 second, then it must travel 100 feet in 1 second. (Multiply both numbers by 5)
If that is true, the train travels 100 ft/s. This means that in 3 seconds, it travels 300 feet!
Hope this helps! :)
Teddy L.
How do you know to multiply them both by 5?09/13/19