given that:
Ms. Reiss walked 3 miles per hour
we are asked to find how many yards per hour is this
firstly, we must fined the relatioship between miles per hour and yards per hour
1 mile per hour = 1760 yards per hour
so, let 3 miles per hour = x
if:
1 mile per hour = 1760 yeards by hour
3 miles per hour = x
let's cross multiply
x = 3 X 1760
x = 5280
Therefore, if Ms. Reiss walked 3 miles per hour, she will walk 5280 yards per hour.