In order to express the 4 minutes and 45 seconds in seconds, we just have to follow these steps:
1 . Note that one part of the time is already in seconds (45 seconds), then we leave it the way it is and just convert the part in minutes.
4 minutes + 45 seconds
2. convert the time in minutes to seconds, one minute is equivalent to 60 seconds, then 4 minutes is equivalent to 4 times 60 seconds, then we get:
4×60 seconds + 45 seconds
240 seconds + 45 seconds
3. Add 240 and 45
240 + 45 = 285
Then, 4 minutes 45 seconds = 285 seconds