Ken can type 50 words per minute while Bill can type 60 words per minute. If they each types a 4200-word essay, how much more time will Ken take than Bill to complete typing the essay?

minutes

The time for Ken: 4200 ÷ 50 = 84

The time for Bill: 4200 ÷ 60 = 70

Thus, the time difference: 84 – 70 = 14