2016 · Q29
A clock strikes once at 1 o’clock, twice at 2 o’clock and thrice at 3 o’clock, and so on. If it takes 8 seconds to strike at 5 o’clock, the time taken by it to strike at 10 o’clock is
Elementary MathematicsNumber System
- A14 seconds
- B16 seconds
- C18 seconds
- DNone of the above
Explanation
Five strikes are separated by 4 intervals taking 8 s, so each interval lasts 2 s. Ten strikes have 9 such intervals. The time taken is 9·2 = 18 s, option C.