Two bulbs flash at regular intervals of 30 and 36 seconds respectively. They flash together at 10 45. At what time will they flash together (a) a second time (b) a 5th time?
Answers
Answer:
10:48
Step-by-step explanation:
Calculate the LCM of 30 seconds and 36 seconds
= 180 seconds= 3 minutes
10:45 + 3 minutes = 10:48.
Hence they will flash together at
10:48.
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Answer:
10:48 and 10:57
Step-by-step explanation:
Two bulbs flash at regular intervals of 30 and 36 seconds respectively.
The time interval between bulbs to flash together = LCM of the intervals of
both bulbs
- LCM of both intervals = LCM of 30 and 36
= 180 seconds or 3 minutes
This implies that they will flash together every 3 minutes
If the bulbs flash together at 10:45 -
The second time they would flash will be = 10:45 + 3 = 10:48
Time taken for the bulbs to light together the fifth time = ( 3+3 )+3 ( as there is the third and fourth time + the fifth time )
The fifth time the bulb will light up is 10:48 + 9 = 10:57
hope it helps you ..