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The time in Kinshasa 20°W is 9.00 am. What is the time in another location given its longitude?
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The time in Kinshasa W is 9.00 am. What is the time in / (4 mks) Assuming the question asks for the time at the Prime Meridian ( longitude):
Determine the longitude difference.
The difference in longitude between Kinshasa ($20^\circ$W) and the Prime Meridian ($0^\circ$) is: $$ \text{Longitude difference} = 0^\circ - (-20^\circ) = 20^\circ $$Convert the longitude difference to time difference.
Since $15^\circ$ of longitude equals 1 hour: $$ \text{Time difference} = \frac{20^\circ}{15^\circ/\text{hour}} = \frac{4}{3} \text{ hours} $$ $$ \frac{4}{3} \text{ hours} = 1 \text{ hour and } \left(\frac{1}{3} \times 60\right) \text{ minutes} = 1 \text{ hour and } 20 \text{ minutes} $$Calculate the time at the Prime Meridian.
The Prime Meridian is to the east of Kinshasa, so the time will be later. $$ \text{Time at Prime Meridian} = 9:00 \text{ am} + 1 \text{ hour } 20 \text{ minutes} $$ $$ \text{Time at Prime Meridian} = 10:20 \text{ am} $$ The time at the Prime Meridian ($0^\circ$ longitude) is $\boxed{\text{10:20 am}}$.
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