formula not changing when copied to new location

Hi.

I'm making a template to count my working hours day by day on a monthly basis.

I put in the time where work starts and ends and how long my breaks were.

the formula for each day looks like this

=(((E10*60)+F10)-((B10*60)+C10))/60-(H10/60)

How do I copy this formula spo that the 10 here (E10) changes to (E11) when I copy it into the next line.

It's hard work to write the formula 30 times

Thanks

John

Denmark