Question

What is the longitude of a place where the local time is 1:15 p.m., when it is 4 a.m. at
Chicago (88°W)?​

Answer 1

Answer:

When it is 4 AM at Chicago ( set to 90°W). GMT is (6hrs ahead) 10 AM. From there 1:15 PM is 3¼ hrs ahead (to east),

Answer 2

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1:15 pm is 9.25 hours later than 4:00 am so (9.25)(15)= 138.75 degrees east of Chicago. That is 138.75- 88= 50.75 degrees east longitude.