Practice!

Sample Problem

At two o’clock, a grandfather clock takes 4 seconds to strikes two times. At four o’clock, it will take seconds for the clock to strike four times.

Solution

If the clock strikes 4 times, there will be 4 - 1 = 3 intervals between the strikes. Each interval is 2 seconds long, so there will be 2 × 3 = 6 seconds between the strikes.