In a school, the bell is rung once after each half an hour. The school starts at 8:00 a.m. and closes at 1:30 p.m. The bell is rung 3 times continuously. at the time of beginning, at the time of lunch break at 10:00 and 10:30 a.m. and at the end. How many times is the bell rung every day?

Options

A. 21
B. 22
C. 19
D. 20

Answer

D

Explanation

01 : 30 - 08 : 00
= 05 : 30 (5 hours 30 minutes) Normally the bell is rung 12 times. But four times it is rung three times. Ie. 8 times extra .
So tota 12 + 8 = 20 times