Question: A class begins at 1:21 p.m. and ends at 3:36 p.m. the same afternoon. How many minutes long was the class?

(A) 457
(B) 215
(C) 150
(D) 135
(E) 75

Correct Answer: D
Solution and Explanation:
Approach Solution 1:

The problem statement states that:

Given:

• A class begins at 1:21 p.m. and ends at 3:36 p.m. the same afternoon.

Find out:

• The class lasts for how many minutes.

Since the class starts at 1:21 p.m. and ends at 3:36 p.m. the same afternoon, we can say:
3 hours - 1 hour = 2 hours
36 minutes - 21 minutes = 15 minutes
Therefore, the time duration between 1:21 PM to 3:36 PM = 2 hours 15 mins

Therefore, to find the answer, we need to transform the time into minutes.
Hence, 2 hours 15 mins can be written as 2*60 + 15 minutes. This can be simplified as 120 +15 which equals 135 mins.
Therefore, the duration of the class is 135 mins.

Approach Solution 2:

The problem statement informs that:

Given:

• A class begins at 1:21 p.m. and ends at 3:36 p.m. the same afternoon.

Find out:

• The class lasts for how many minutes.

To solve this problem, we need to set up a subtraction problem that could be used to find the number of hours and minutes that pass between those two times.
Let’s subtract the starting time from the stopping time.
It is required to remember that both times represent the number of hours and minutes past noon.

3:36 p.m.
– 1:21 p.m.
_________________
2:15

Therefore, the duration of the class=2: 15
= 2 hours 15 minutes
= 2*60 + 15 minutes
= 120 +15 minutes
=135 mins

Therefore, the class lasts for 135 mins.

Approach Solution 3:

The problem statement implies that:

Given:

• A class begins at 1:21 p.m. and ends at 3:36 p.m. the same afternoon.

Find out:

• The class lasts for how many minutes.

The class started at 1:21 p.m.
The class ended at 3:36 p.m.
This implies that the total minutes the class lasts for = 9 min + 30min + 60min + 36min = 135 minutes
Hence, the class lasts for 135 mins.

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