Question

Five bells beginning together toll at interval of 4,5,7,8and 10 s respectively. After what interval of time will they toll again together?
1. 4 min 35 s
2. 4 min 40 s
3. 4 min 45 s
4. 4 min 51 s​

Answer 1

Answer:

The interval at which they will toll again

= L.C.M of 4,5,7,8,10

4 = 2×2

5 = 5

7 = 7

8 = 2×2×2

10 = 2×5

L.C.M

= 2×2×2×5×7

= 280

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Hence after 280 sec = 4 min 40 sec ,the bells will toll again.

Answer 2

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