5. By subtracting 2/3
of an hour from an hour is
(a) 60 minutes (b) 40 minutes (c) 20 minutes (d) 10 minutes
Answers
Answer:
(c) 20 minutes because when we minus 1-2/3 =20
Answer:
Subtracting Time - Definition with Examples
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Subtracting Time
Time tells us about the duration of a task or an event.
We measure time in hours, minutes, and seconds. There are 60 minutes in an hour and 60 seconds in a minute.
Subtracting Time
Subtracting hours and minutes
Here are the steps to subtract time (4 hours 45 minutes - 2 hours 20 minutes) given in hours and minutes.
Step I: Check if the minutes of the first time (4 hours 45 minutes) is less than the minutes of the second time (2hour 20 minutes). If that is the case then,
Take one away from the hours of the first time.
Add 60 to the minutes of the first time.
(Since 45 is not less than 20, we move on to the next step)
Step II: Subtract the minutes. (45 minutes - 20 minutes = 25 minutes)
Step III: Subtract the hours. (4 hours - 2 hours = 2 hours)
Hence, the resultant from Step II and Step III together is the answer (2hours 25minutes).
Example 1: Solve the following
7 hours 45 minutes – 6 hours and 15 minutes.
7 hours 15 minutes – 6 hours and 45 minutes
Solution:
A.
Step I: Since 45 is not less than 15, we move on to the next step
Step II: On taking away the minutes, we get,
45 minutes
– 15 minutes
30 minutes
Step III: On taking away the hours, we get,
7 hours
– 6 hours
1 hour
Hence, the answer is 1 hour and 30 minutes.
B.
Step I: Since 15 is less than 45, we take one away from the hours of the first time and add 60 to the minutes of the first time.
7 – 1 = 6 hour
15 + 60 = 75minutes
Step II: On taking away the minutes, we get,
75 minutes
– 45 minutes
30 minutes
Step III: On taking away the hours, we get,
6 hours
– 6 hours
0 hours
Hence, the answer is 0 hours 30 minutes or just 30 minutes.