An electronic clock in a Delhi railway station beeps every 30 seconds, and a second beeps every 45 seconds. They beep together at 9:00:00 am. After how many seconds will they next beep together?

Question

Accepted Answer

90. They beep together after LCM(30, 45) seconds. 30 = 2x3x5, 45 = 3^2 x 5; LCM = 2 x 3^2 x 5 = 90 s.

An electronic clock in a Delhi railway station beeps every 30 seconds, and a second beeps every 45 seconds. They beep together at 9:00:00 am.
After how many seconds will they next beep together?

Step-by-Step Solution

Master this chapter in 30 minutes a day.

More Class 10 HCF and LCM practice

An electronic clock in a Delhi railway station beeps every 30 seconds, and a second beeps every 45 seconds. They beep together at 9:00:00 am.After how many seconds will they next beep together?

Step-by-Step Solution

Master this chapter in 30 minutes a day.

More Class 10 HCF and LCM practice

An electronic clock in a Delhi railway station beeps every 30 seconds, and a second beeps every 45 seconds. They beep together at 9:00:00 am.
After how many seconds will they next beep together?