Calculate the duration between two given times using the direct subtraction method.

Question

ScanSolve AI Tutor · Accepted Answer

Okay, I can show you a direct subtraction method that many find easier for these types of problems.

Here are the durations for the problems using the direct subtraction method:

1. Duration from 1:20 p.m. to 2:30 p.m.

Write the end time and start time, aligning hours and minutes.
$\begin{array}{c} 2 \text{ hours } 30 \text{ minutes} \\ - 1 \text{ hour } 20 \text{ minutes} \\ \hline \end{array}$
Subtract the minutes.
Since $30 \ge 20$ , no borrowing is needed.
$30 - 20 = 10 \text{ minutes}$
Subtract the hours.
$2 - 1 = 1 \text{ hour}$
Combine the results.
The duration is 1 hour 10 minutes, which is $60 + 10 = 70$ minutes.
The duration is $\boxed{\text{70 minutes}}$ .

2. Duration from 2:25 p.m. to 3:10 p.m.
Write the end time and start time, aligning hours and minutes.
$\begin{array}{c} 3 \text{ hours } 10 \text{ minutes} \\ - 2 \text{ hours } 25 \text{ minutes} \\ \hline \end{array}$
Subtract the minutes.
Since $10 < 25$ , borrow 1 hour (60 minutes) from the hours column of the end time.
The end time becomes 2 hours and $10+60=70$ minutes.
$70 \text{ minutes} - 25 \text{ minutes} = 45 \text{ minutes}$
Subtract the hours, using the adjusted hour for the end time.
$2 \text{ hours} - 2 \text{ hours} = 0 \text{ hours}$
Combine the results.
The duration is 0 hours 45 minutes.
The duration is $\boxed{\text{45 minutes}}$ .

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