in 2 days and 20 hour a watch gains 20 seconds. find how much time the watch take to gain 35 second.
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2 days and 20hours = 68 hours
Using proportional method,
68:20::x:35
68 * 35 =20x
= x = 68 * 35 / 20
= x= 17 * 7
x = 119hours
ANSWER = 119 hours or 4 days 23 hours
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