Question

Doug entered a canoe race. He rowed 3.5 miles in half an hour. What is his average speed in miles per hour?

Answer 1

average speed `=7` miles per hour

Explanation:

Another way to express the ratio
`color(white)("XXX") 3.5` miles per half-hour
is
`color(white)("XXX")(3.5 "miles")/(1/2 "hour")`

`(3.5)/(1/2) ("miles")/("hour") = 3.5 xx 2/1 ("miles")/("hour")`

`color(white)("XXXXXXX")= 7.0 ("miles")/("hour")`