How much dies a watch gain or lose per day if its hands coincide every 66 minutes?

11 min 52 sec

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11 min 54 sec

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11 min 53 sec

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11 min 55 sec

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Solution

The correct option is B 11 min 54 sec
In every correct watch the two hands coincide at interval of 65511 min
As in the given watch two hands coincide at interval of 66 min so this watch loses
66−65511=611 min
Now 6624×60=611?
∴ ?=11 min 54 sec.

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Q80. How much does a watch lose per day, if its hands coincide every 64 min?

64

64

65 \frac{3}{11}

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