What's the difference between an hour and a half and an hour and a half? As above PS: what's the difference between two and a half hours and two and a half hours?

One hour and a half: 30 minutes
One and a half hours: 90 minutes
Two and a half hours: 150 minutes
Two and a half hours: 60 minutes

RELATED INFORMATIONS

1. Is 2.5 hours equal to 2.5 hours Is 2.5 hours two and a half hours? If not, how many hours?
2. How many seconds is 2.5 hours
3. How many days is 17657 minutes
4. What is the trigonometric function value of 2 degrees 51 minutes 43 seconds
5. How many milliseconds is one second? 1001000? Some say it's 100 milliseconds, others say it's 1000 milliseconds. How much is it? What is the unit behind the electronic stopwatch? What's the next unit of seconds? Centisecond or millisecond? What are the two decimal places after the second of the stopwatch? I've seen 66 after the second of the stopwatch, For example, 00:01:06:66 1 minute 6 seconds 66. What's the unit behind 66?
6. How can 4 = 4 be equal to 4?
7. Definition of acute triangle function
8. In RT △ ABC, ∠ C = 90 ゜, with the help of your two trigonometric rulers, according to the definition of acute trigonometric function, four trigonometric function values of ∠ a are obtained （1）∠A＝30゜（2）∠A＝60゜（3）∠A＝45゜.
9. Why can't cos (360-60) = cos (- 60) be equal to - cos60
10. Trigonometric function: cos45 ° / - tan45 ° - sin30 ° = - √ 2 / 2 / - 1-1 / 2, = √ 2 / 3, why does positive cos45 ° become negative?
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