Fireworks can go up to 1000 feet in around 3 seconds. What is it’s aver vertical speed in feet per second and miles per hour

Question

I need help with this math homework question because I really don’t know how to do it 

Answer 1

1000 fi / 3 sec

333 1/3 ft / 1 sec   divide both by 3

 

1000 ft = 0.1893 mi    divide by 5280 (feet per mile)

0.1893 mi / 3 sec

227.16 mi / 1 hr          multiply both by 1200  (3 times 1200 = 3600 sec = 1 hour)