Jeff paddles a canoe 3/5 mile in 1/4 hour. at this rate, how far does jeff paddle in a half hour? show all the steps.

He can go 3/5 of a mile in 1/4 of an hour. 1/2 of an hour is twice that of 1/4 of an hour
so all you have to do is double the 3/5 
3/5+3/5= 6/5 or 1 1/5 miles
alternatively you can just multiply by two, 
3/5*2/1=6/5 or 1 1/5 miles

This is a proportion problem. I would turn them into decimals to get the best result.
3/5= .6
1/4= .25
1/2= .5
Do the proportion
.6/.25= x/.5
Cross multiply and divide
.5 x .6= .3
.3 divide by .25= 1.2
Now turn this into a fraction.
1.2= 1 2/10
Now simplify
Answer is 1 1/5

X= 2 he can buy 2 packs of cards for $12 and an action figure for $3 so he would spend $15 in total plus the free poster