To complete 84 hours, how many relations will the hour hand of a clock take?

7

(the hour hand of a clock moves 360 degrees in 12 hours, which means it moves 30 degrees per hour)

So,

=> 84 hours ÷ 12 hours = 7

Since the hour hand moves 30 degrees per hour;

=> 7 hours × 30 degrees/hour = 210 degrees

Since the hour hand has moved 210 degrees, it will take 7 hours to complete this distance.

Thus, the correct answer is "7".