Greetings!
"A ruby throated hummingbird beat its wings 159 times in 3 seconds how many times does the ruby-throated hummingbird beat its wings per second?"...
3seconds/3=1 second
Therefore:
159/3= flaps per second.
159/3=53
A humming bird flaps their wings, 53 times a second.
Hope this helps.
-Benjamin