讲解一下这两道题---Here is the extracted content from the image:
**General Information:**
Spark Math
Challenge yourself to succeed.
Challenge
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**Question 1:**
**Question Stem:**
When it is 08 00 in Los Angeles, it is 23 00 in Singapore. When it was 06 00 in Los Angeles, Benny took a plane from Los Angeles to Singapore. The duration of the journey was 13 h 50 min.
**(a)** What was the time in Singapore when the plane left Los Angeles?
**(b)** What was the time in Singapore when the plane landed?
(Express your answer using the 24-hour clock.)
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**Question 2:**
**Question Stem:**
When it is 11 30 in Sydney, it is 09 30 in Singapore. When it was 19 00 in Sydney, Abby took a plane from Sydney to Singapore. The duration of the journey was 6 h 45 min.
**(a)** What was the time in Singapore when the plane left Sydney?
**(b)** What was the time in Singapore when the plane landed?
(Express your answer using the 24-hour clock.)
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答案文本
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Time zones are regions of the Earth that have the same standard time. Different cities around the world have different local times based on their geographic location. For example, when it's 8 AM in Los Angeles, it's 11 PM the same day in Singapore - a 15-hour difference. Similarly, when it's 11:30 AM in Sydney, it's 9:30 AM in Singapore - a 2-hour difference. Understanding these time differences is crucial for solving flight time problems.
Now let's organize the information from both problems. Problem 1 involves a flight from Los Angeles to Singapore. We know that when it's 8 AM in Los Angeles, it's 11 PM in Singapore. The plane departed at 6 AM Los Angeles time and the flight duration was 13 hours and 50 minutes. Problem 2 involves a flight from Sydney to Singapore. When it's 11:30 AM in Sydney, it's 9:30 AM in Singapore. The plane departed at 7 PM Sydney time with a flight duration of 6 hours and 45 minutes.
To convert time between different time zones, we follow a systematic two-step method. First, we find the time difference between the cities. From the given information, when it's 8 AM in Los Angeles, it's 11 PM in Singapore. This means Singapore is 15 hours ahead of Los Angeles. Second, we apply this time difference to convert any Los Angeles time to Singapore time. For example, if a plane departs at 6 AM Los Angeles time, we add 15 hours to get 21:00 or 9 PM Singapore time.