Interview Q&A / Aptitude

1. How many times in a day do the hands of a clock coincide, and how many times are they at right angles?

   They coincide 22 times in 24 hours (11 times every 12 hours, since the coincidence between 11 and 1 happens only once, at 12). They are at right angles 44 times a day and opposite each other 22 times.

   BeginnerQuick answer1 min read
2. What is the angle between the hour and minute hands of a clock at 3:40?

   130 degrees. The minute hand is at 40 x 6 = 240 degrees. The hour hand is at 3 x 30 + 40 x 0.5 = 110 degrees. The difference is 130 degrees (the reflex angle on the other side is 230).

   BeginnerQuick answer1 min read