Amy and Beatrice each has a watch.The two watches were set correctly at 9 o'clock in the morning.Amy's watch is faster than Beatrice's watch by 1 minute every 1 hour ;Beatrice's watch is slower than the actual time by 2 minutes every hour .If Amy's watch showed 10:ab:cd (in the format of HH:MM:SS )when the actual time is 11 o'clock in the same morning, write down the 4-digit number abcd . CLUE: NOT 5700
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After an hour of actual time has lapsed, Beatrice's watch would show 58 minutes. Her watch movement rate is ω B = 6 0 5 8 on actual time. When Beatrice's watch shows 1 hour or 60 minutes, Amy's watch shows 61 minutes. The movement rate of Amy's watch is then ω A B = 6 0 6 1 on Beatrice's time. Therefore, the movement rate of Amy's watch on actual time is given by ω A = ω A B ω B = 6 0 × 6 0 6 1 × 5 8 .
After two hours of actual time has lapsed, the time shown on Amy's watch is:
t = 6 0 × 6 0 6 1 × 5 8 × 2 × 6 0 × 6 0 s = 0:0:7076 = 0:117:56 = 1:57:56
Therefore the time shown on Amy's watch is 10:57:56 , then a b c d = 5 7 5 6 .
2 hrs × 1 hr 6 0 min × 6 0 min 5 8 Beatrice min × 6 0 Beatrice min 6 1 Amy min = 1 5 1 7 6 9 Amy min = 1 : 5 7 : 5 6 Amy
Thus, Amy's watch will show 9 : 0 0 : 0 0 + 1 : 5 7 : 5 6 = 1 0 : 5 7 : 5 6 .
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For each hour in Beatrice's watch,it was 61 minutes in Amy's watch;for every hour in actual time,it was * 6 0 6 1 ∗ 5 8 * that is 58 6 0 5 8 minutes in Amy's watch.This means that Amy's watch is slower than actual time by 1 minute and 2 seconds every hour.For two hours in actual time, Amy's watch was slower by 2 minutes and 4 seconds .Thus the watch showed *10:57:56 so abcd=5756( is times):) **