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A bulb glows 3 times per minute and a bell chimes 5 times in two minutes at regular intervals. If the bulb glows and the bell chimes together at the start of the hour, how many times do they glow and chime together in next 60 minutes?

A.	30	B.	24
C.	20	D.	60

Answer and Explanation

Answer:30

Explanation:
The bulb glows every 20 sec and the bell chimes every 24 sec. The time after which the bulb glows and the bell chime is = LCM (24,20) =120 second or 2 minutes. In 60 minutes, they will glow and chime together 30 times.

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