Singapore is located at longitude \(104^{\circ}\text{E}\) and Buenos Aires is located at longitude \(58^{\circ}\text{W}\). What is the time in Buenos Aires when it is 9:20 am in Singapore?
- 10:08 pm
- 8:32 pm
- 10:32 pm
- 8:08 am
Aussie Maths & Science Teachers: Save your time with SmarterEd
Singapore is located at longitude \(104^{\circ}\text{E}\) and Buenos Aires is located at longitude \(58^{\circ}\text{W}\). What is the time in Buenos Aires when it is 9:20 am in Singapore?
\(C\)
\(\text{Longitudinal difference} = 104^{\circ}+58^{\circ}=162^{\circ}\)
\(\text{Calculate the time difference (using 15° = 1 hour time difference):}\)
\(\text{Time Difference} = \dfrac{162}{15} \text{ hours} = 10.8\text{ hours}=10\text{ hours}\ 48\ \text{minutes} \)
\(\text{Singapore is east of Buenos Aires}\ \ \Rightarrow\ \ \text{Singapore is ahead}\)
\(\text{Time in Singapore}\ =\ 9:20\ \text{am}\)
| \(\therefore\ \text{Time in Buenos Aires}\) | \(=9:20\ \text{am}-10\ \text{hours}\ 48\text{ minutes}\) |
| \(=11:20\ \text{pm}-48\ \text{minutes}\) | |
| \(=10:32\ \text{pm (previous day)}\) |
\(\Rightarrow C\)