Jan takes #1.6# minutes to run a quarter of a mile. How long will he take to run #1# mile?

2 Answers
Feb 11, 2017

#6.4" minutes"#

Explanation:

There are 4 ,#1/4"of a mile in one mile"#

#"That is "4xx1/4=1#

Running at a constant rate, will take 4 times as long.

#1/4"mile"to1.6" minutes"#

#1"mile"to4xx1.6=6.4" minutes"#

Feb 14, 2017

#= 6.4 " minutes for 1 mile"#

Explanation:

If you were to work out his actual speed in "minutes per mile" that will give you the time to run 1 mile.

("per" means for each, or for 1)

So treating this as a rate question, "minutes per mile" tells us what to divide by what.

#1.6 " minutes for " 1/4 " mile"" "rArr 1.6 div 1/4#

#1.6 xx4/1" "larr# multiply by the reciprocal

#= 6.4 " minutes per mile"#