3. In 2 days and 20 hours a watch gains 20 sec. Find, how much time the watch will take to gain 35 sec.
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Answer:
2 days 20 hours = 2 × 24 + 20 = 48 + 20
= 68 hours
Now 20 sec. are gained in = 68 hours
∴ 1 sec. will be gained in = 68/20 hours
35 sec. will be gained in = 68/20 × 35
= 119 hours
= 119 ÷ 24 days
= 4 days 23 hours
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