A digital wristwatch was set accurately at 8.30 am and then lost 2 seconds every 5 minutes What time was indicated on the watch at 6.30 pm of the same day if the watch operated continuously t?
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Answer:
Time difference between accurate start and finish times = 10 hours. 1 hour = 60 minutes : 10 hours = 600 minutes. Number of 5 minute intervals in 600 minutes = 600 ÷ 5 = 120 In total the watch loses 120 x 2 = 240 seconds = 240 ÷ 60 = 4 minutes. The time shown on the watch (at 6.30pm) is 6.26 pm.
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