Aschool cafeteria makes cheese sauce for macoroni using 15 cups of swiss cheese and 17 cups of cheddar cheese. perry tries to make the sauce for a family party using 5 cups of swill and 7 cups of cheddar is perry using the correct ratio?

Sound travels about 750 miles per hour. a) suppose it takes about 1.5 seconds to hear the echo. how far away is the canyon wall, in feet? for this i got 825 ft b) suppose you stand 1,925 feet from the canyon wall and sound the horn. how long will it take to hear the echo? (i'm stuck on this)