Three bells toll together at intervals of 30, 36 and 45 minutes respectively. At what time will they toll together again if they toll simultaneously at 8 A.M?

2 P.M

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11 A.M

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1 P.M

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12 A.M

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Solution

The correct option is B
11 A.M

The LCM $= 2 \times 3 \times 3 \times 2 \times 5 = 180$ Thus, the three bells will toll together every 180 minutes.

After 180 minutes, that is 3 hours later from 8 A.M, so, at 11:00 AM.

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Three bells toll together at intervals of 30, 36 and 45 minutes respectively. At what time will they toll together again if they toll simultaneously at 8 A.M?

The correct option is B 11 A.M The LCM =2×3×3×2×5=180 Thus, the three bells will toll together every 180 minutes. After 180 minutes, that is 3 hours later from 8 A.M, so, at 11:00 AM.

The correct option is B
11 A.M

The LCM $= 2 \times 3 \times 3 \times 2 \times 5 = 180$ Thus, the three bells will toll together every 180 minutes.

After 180 minutes, that is 3 hours later from 8 A.M, so, at 11:00 AM.