Problema Solution
Sarah can eat a box of popcorn in 10 minutes. Janet can eat a box of popcorn in 15 minutes. They go to the movies and share a box of popcorn. How long will it take them to finish it?
Answer provided by our tutors
the rate of Sarah is: 1/10 boxes per min
the rate of Janet is: 1/15 boxes per min
let x = the minutes it takes them to finish the box of popcorn together
the together rate is: 1/x boxes per min
1/10 + 1/15 = 1/x
by solving we find
x = 6 min
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it will take them 6 minutes to finish the box of popcorn together.