Exercise :: Clock  General Questions
 Clock  Important Formulas
 Clock  General Questions
16.  At what time, in minutes, between 3 o'clock and 4 o'clock, both the needles will coincide each other? 

Answer: Option D Explanation: At 3 o'clock, the minute hand is 15 min. spaces apart from the hour hand. To be coincident, it must gain 15 min. spaces. 55 min. are gained in 60 min.

17.  How many times do the hands of a clock coincide in a day? 

Answer: Option C Explanation: The hands of a clock coincide 11 times in every 12 hours (Since between 11 and 1, they coincide only once, i.e., at 12 o'clock). AM
12:00 PM
12:00 The hands overlap about every 65 minutes, not every 60 minutes. The hands coincide 22 times in a day. 
18.  How many times in a day, the hands of a clock are straight? 

Answer: Option C Explanation: In 12 hours, the hands coincide or are in opposite direction 22 times. In 24 hours, the hands coincide or are in opposite direction 44 times a day. 
19.  A watch which gains uniformly is 2 minutes low at noon on Monday and is 4 min. 48 sec fast at 2 p.m. on the following Monday. When was it correct? 

Answer: Option B Explanation: Time from 12 p.m. on Monday to 2 p.m. on the following Monday = 7 days 2 hours = 170 hours.
Watch is correct 2 days 2 hrs. after 12 p.m. on Monday i.e., it will be correct at 2 p.m. on Wednesday. 