For every 2 laps that jackie swims, ronnie swims 3 laps. during practice, they swam a combined total of 80 laps. how many laps did ronnie swim during practice? options: 32 36 45 48

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)