Mr frost typed for 12 minutes at a constant rate of 50 words per minute. Mrs. grey typed the same number of words at a constant rate of60 words per minute how many minutes did it take Mrs. Grey to type the same amount as mr frost?
Mr Frost typed 600 words in 12 minutes (50×12) so to find out how fast it took mrs. grey to type 600 words you just 600÷60 (because that's how many words a minute Mrs. grey types)