A car travels 70 miles in 80 minutes. Which is its average speed per minute?

Question

amistre64 · Answer

any ideas?

anonymous · Answer

its either 11 miles, 8.75 miles, 1.14 miles, or 0.875 miles

amistre64 · Answer

we want to convert 80 minutes to 1 minute.  Do you have any thoughts on how we can do this?

anonymous · Answer

nope

amistre64 · Answer

well, if we divide it into 2 equal parts ... 80 minutes/2 = 40 minutes and 40 minutes .... this doesnt give us equal parts of 1 minute does it.

dividing into 3 equal parts doesnt pan out either ... what would we have to divide 80 minutes by in order to get equal parts of 1 minute each?

amistre64 · Answer

another way to look at it is this:  we are given a ratio of 70:80.  we want values of 70n:80n to maintain the ratio.

so,  70n = ?  when 80n=1.  we just need to solve for n to determine the answer as 70n.