if the time is 8:50 and sally needs to go to a class at 10:30 how many hours and minutes will she need to put in a timer to remind her?

She can do 9:30 to 10:15!

Step-by-step explanation:

Helping out!

It is 8:50, 10 minutes before 9:00.

From 9:00 to 10:00 is 60 minutes, or one hour.

10:00 to 10:30 is 30 minutes.

So, take all of the minutes you figured out and add them.

10+60+30=100

One hour is 60 minutes, so if we subtract that from 100 minutes (100-60) we are left with 40 minutes.

Of course, this is an exact timing. If she wants to arrive 15 minutes earlier,

100-15=85

85-60=25

So, then she could put a timer for 1 hr 25 mins.

Therefore, Sally must put a timer for 1 hour and 40 minutes, if she wants the exact time of the class.

Hope this helps.

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Step-by-step explanation: