Measurement, STD2 EQ-Bank 4 MC

Melbourne is located at longitude \(145 ^{\circ}\text{E}\) and Tokyo is located at longitude \(140^{\circ}\text{E}\). Based purely on longitudinal difference, what is the time in Tokyo when it is 2:00 pm in Melbourne?

1:40 pm
1:48 pm
2:12 pm
2:20 pm

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\(A\)

Show Worked Solution

\(\text{Longitudinal difference} = 145^{\circ}-140^{\circ} = 5^{\circ} \)

\(\text{Time difference (15° = 1 hour time difference):}\)

\(\text{Time Difference} = \dfrac{5}{15} \text{ hours} = \dfrac{1}{3} \text{ hour} = 20 \text{ minutes} \)

\(\text{Since Melbourne is further east}\ \ \Rightarrow\ \ \text{it is ahead}\)

\(\text{Time in Melbourne}\ =\ 2:00\ \text{pm}\)

\(\text{Time in Tokyo}= 2:00\ \text{pm}-20\ \text{minutes}=\ 1:40\ \text{pm}\)

\(\Rightarrow A\)