John sent 45 text messages in 9 minutes. What is the unit rate?

Answer 1

45/9 = 15/3 = 5/1 = 5 text messages per 1 minute = 1 text message per 1/5 minute = 1 text message per 12 seconds

"unit" means one = 1

He's texting at the rate of 1 text per 12 seconds