This is a simple distance = rate * time problem. Just use that formula and you'll solve these types of problems in no time!
Chandler's speed or the rate is 1/16 km per 1/6 of an hour and the time is one hour.
Because we have the rate and the time, just multiply both values to get the answer.
1/16 km / 1/6 h * 1 hour = 0.375 km