5. Today Sarah's piano lessons started at 4,15 P.M. She was finished with her lessons at $$ 5: 10 $$ P.M. How long was Sarah at piano lessons?

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1. Write down the start and end times:  
   - Start time: $$ 4:15 $$ P.M.  
   - End time: $$ 5:10 $$ P.M.

2. Break the time interval into two parts:  
   - From $$ 4:15 $$ P.M. to $$ 5:00 $$ P.M.  
   - From $$ 5:00 $$ P.M. to $$ 5:10 $$ P.M.

3. Calculate the duration for each part:  
   - Duration from $$ 4:15 $$ P.M. to $$ 5:00 $$ P.M.:  
     $$
     5:00 - 4:15 = 45 \text{ minutes}
     $$
   - Duration from $$ 5:00 $$ P.M. to $$ 5:10 $$ P.M.:  
     $$
     5:10 - 5:00 = 10 \text{ minutes}
     $$

4. Add the two durations together:  
   $$
   45 \text{ minutes} + 10 \text{ minutes} = 55 \text{ minutes}
   $$

Thus, Sarah was at piano lessons for $$ 55 $$ minutes.
Sarah was at piano lessons for 55 minutes.

Today Sarah’s piano lessons started at 4,15 P.M.
She was finished with her lessons at P.M.
How long was Sarah at piano lessons?

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Today Sarah’s piano lessons started at 4,15 P.M. She was finished with her lessons at P.M. How long was Sarah at piano lessons?