Discussion
What is the local time of Thimphu (Bhutan) located at 90° East longitude when the time at Greenwich (0°) is 12:00 noon?
Answer: A
The local time is 6:00 p.m.
The Earth turns 360° in 24 hours, so each degree of longitude makes a difference of 4 minutes. Thimphu is 90° east of Greenwich:
\[ 90 \times 4 = 360\ \text{minutes} = 6\ \text{hours} \]
Places east of Greenwich are ahead in time, so when it is 12 noon at Greenwich it is 6:00 p.m. at 90° E. 6:00 a.m. is what a place 90° west would have.
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