Answer:
4 miles per hour
Step-by-step explanation:
I know that the hot air balloon moves 2/5 mile in 1/10 hour. To find how many miles this hot air balloon moves in an hour, I had to multiply both 2/5 and 1/10 by 10. I got 4 miles in 1 hour.
2/5 mile in 1/10 hour
* 10 on both sides
4 miles in 1 hour
Hope this helps :)