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     EduGorilla 
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    A customer in a coffee shop experiences that his coffee becomes cooler by 20oC in a minute. The ambient temperature of the surroundings is 30oC and the initial temperature of the coffee is 80oC. If the customer wants to take his coffee at 50oC, how much more time does he have to wait for?

    Options :-

    1. 48 sec
    2. 60 sec
    3. 129 sec
    4. 145 sec
    5. None of these
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