How far in feet?

Question

Sound travels about 750 miles per hour. If you stand in a parking lot near a building and sound a horn, you will hear an echo.

Suppose it takes about ½ a second to hear the echo. How far away is the building in feet? __________ feet

Answer 1

750 mph= 750 miles per 3600 seconds

m/(1/4)= 750/3600=75/360=25/120=5/24

m= (1/4)(5/24)= 5/96 mile to the building

= (5/96)(5280) 1 mile=5280 feet

= 5(440)3/24= 5(440/8)=5(55)

= 275 feet