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A mechanical grandfather clock is at ...

A mechanical grandfather clock is at present showing 7 hr 40 min 6 sec. Assuming that it loses 4 seconds in every hour, what time will it show after exactly `6 1/2` hours? (a) 14 hr 9 min 34 sec (b) 14 hr 9 min 40 sec (c) 14 hr 10 min 6 sec (d) 14 hr 10 min 32 sec

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