A lighthouse 1 flashes its light every 15 minutes. A light house 2 flashes every 18 menutes. If the two light houses flash together at 1:00 am , what time they will next flash together?
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Answer:
2:30am
Step-by-step explanation:
15=5x3
18=3x3x2
common factor in 15 and 18 is 3
so lcm(15,18)=5x2x3x3=90
after 90 min they will flash together again
so, 2:30am
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