Question

On a typical day flights at a local airport arrive at a rate 10 every 15 minutes at this rate how many would you expect to arrive in 1 hour

Answer 1

How many times do 15 minutes fit into one hour? 4 times: 4*15=60 mins.

So that means that 4 times per hour 10 flights appear, and in total 4*10=40 planes arrive over one hour!