The time in Kinshasa 20°W is 9.00 am. What is the time in another location given its longitude?

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15. The time in Kinshasa $20^\circ$W is 9.00 am. What is the time in / (4 mks) Assuming the question asks for the time at the Prime Meridian ($0^\circ$ longitude):

    Step 1: Determine the longitude difference. The difference in longitude between Kinshasa ($20^\circ$W) and the Prime Meridian ($0^\circ$) is: $Longitude difference = 0^\circ - (-20^\circ) = 20^\circ$

    Step 2: Convert the longitude difference to time difference. Since $15^\circ$ of longitude equals 1 hour: $Time difference = \frac{20^\circ}{15^\circ/hour} = \frac{4}{3} hours$ $\frac{4}{3} hours = 1 hour and \left(\frac{1}{3} \times 60\right) minutes = 1 hour and 20 minutes$

    Step 3: Calculate the time at the Prime Meridian. The Prime Meridian is to the east of Kinshasa, so the time will be later. $Time at Prime Meridian = 9:00 am + 1 hour 20 minutes$ $Time at Prime Meridian = 10:20 am$

    The time at the Prime Meridian ($0^\circ$ longitude) is $\boxed{10:20 am}$.