The temperature at 2 pm was 22 degree above zero. If it decreased at the rate of 3 degree per hour until mid night , at what time would the temperature be 2 degree below zero
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At 11 o'clock.
You have to Go through 22 degrees in all.
Rate of Dropping of temperature =2 degrees/ hour
Hence to Come to to 22 degrees You need 22/2= 11 hours.
Starting from 12 noon.
12+11=23hrs. i.e. @ 11 pm
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