Question: At 9 A . M . , a thermometer reading 7 0 F is taken outdoors where the temperature is 1 5 F . At

At 9 A.M., a thermometer reading 70F is taken outdoors where the temperature is 15F. At 9:05 A.M., the thermometer reading is 45F. At 9:10 A.M., the thermometer is taken back indoors where the temperature is fixed at 70F. Find (a) the reading at 9:20 A.M. and (b) when the reading, to the nearest degree, will show the correct (70F) indoor temperature.
ANS.
(a)58F; (b)9:46 A.M.
At 9 A . M . , a thermometer reading 7 0 F is

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