Answer :
Final answer:
The latest time the class can start a 1-hour test to be able to finish by 11:30 (half past eleven) is 10:30.
Explanation:
The latest time the class can start the test to get to lunch on time is calculated by subtracting the duration of the test from the time they need to finish. They need to finish the test by half past 11, which is 11:30, and the test is 1 hour long. So, we can conclude if we subtract 1 hour from 11:30, we get 10:30. Hence, the latest time the class can start the test is 10:30.
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