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13 Jan 2021, 07:35
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A certain cathedral bell marks every hour by ringing a number of times equal to the current hour (for example, at 2:00PM, the bell rings twice). Each toll of the bell lasts for three seconds, with two seconds of silence between tolls. At 9:00AM, how many seconds elapse between the beginning of the first toll and the end of the last toll?
(A) 52
(B) 48
(C) 45
(D) 43
(E) 40
(A) 52
(B) 48
(C) 45
(D) 43
(E) 40
13 Jan 2021, 22:56
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Pattern \(TST=3+2+3= 8\) where T-Toll S-Silence
The total activity at 9 AM;
\(9 T+8S=9*3+8*2=27+16=43\)
Since the number of 'S' is one less than the number of 'T' in the above pattern.
ANS D
The total activity at 9 AM;
\(9 T+8S=9*3+8*2=27+16=43\)
Since the number of 'S' is one less than the number of 'T' in the above pattern.
ANS D
14 Jan 2021, 00:10
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Bunuel
A certain cathedral bell marks every hour by ringing a number of times equal to the current hour (for example, at 2:00PM, the bell rings twice). Each toll of the bell lasts for three seconds, with two seconds of silence between tolls. At 9:00AM, how many seconds elapse between the beginning of the first toll and the end of the last toll?
(A) 52
(B) 48
(C) 45
(D) 43
(E) 40
(A) 52
(B) 48
(C) 45
(D) 43
(E) 40
From the beginning of a toll to the beginning of the next toll, it takes 3 + 2 = 5 secs.
At 9:00, the bell will toll 9 times so it will take 9 * 5 = 45 secs
But note that after the 9th toll of 3 secs, there is no 2 sec interval because the bell does not toll after that. Hence beginning of first toll to end of last toll will last for only 45 - 2 = 43 secs
Answer (D)
