A traffic light at a crossing changes after every 30 seconds.At a certain time,both the lights change together.After how many seconds of their changing simultaneously will they change again it one time.
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To find the time at which they will again change together, we have to compute the L.C.M. of 32 and 40.
32 = 2*2*2*2*2
40 = 2*2*2*5
L.C.M. of 32 and 40 = 2*2*2*2*2*5
= 160 Second
So, after 160 seconds or 2 minutes and 40 seconds, the two traffic lights will again change together.
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gopikakinkar51:
Where is 32 & 40
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