alleryतीन घंटियां क्रमशः 12, 15 और 20 मिनट के अंतराल पर बजती हैं और वे सुबह 9:00 AM पर एक साथ बजीं। वे अगली बार कब एक साथ बजेंगी?
A9:30 AM
B10:00 AM
C9:45 AM
D10:15 AM
Answer & Solution
Correct answer: B. 10:00 AM
12, 15 और 20 का LCM = 60 मिनट = 1 घंटा। अगली बार वे 9:00 + 1:00 = 10:00 AM पर बजेंगी।
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