A train travels 20 feet in 1/5 seconds. At this same speed, how many feet will travel in three seconds?

Question

A train travels 20 feet in 1/5 seconds. At this same speed, how many feet will travel in three seconds?

Answer 1

1 second is 5 times longer than 1/5 second, so 3 seconds is 15 times longer than 1/5 second, so the train will travel 15 times as far in 3 seconds as it does in 1/5 second.