its 4 pm in madrid at 12 degree west longitude find the time of Singapore at 120 degree east longitude ​

11PM

Explanation:

You must start by finding the difference in longitude (or degrees) of the two places. You do this by adding the two numbers. Then, divide by the 15 degrees that occurs in one hour and this will give you the time difference. Longitudes located in the western hemisphere are indicated by a negative sign; longitude located in the Eastern hemisphere are indicated by a positive sign.

-12⁰ + 120⁰ = 108⁰

108⁰ ÷ 15 = 7.2 hours = 432 minutes = 7 hours 12 minutes

4PM in Madrid + 7 hours (12 minutes) = 11PM in Singapore

It is important to realize that Spain uses DST, so right now, in the summer, Singapore is only 6 hours ahead of Madrid. It is only 10PM!

i think it's b or c hope this