we know that
Peter has already delivered 2 pizzas in 5 minutes
so
1 hour-------> 60 minutes
time left------> 60 minutes - 5 minutes--------> 55 minutes
pizzas to deliver to beat his previous record----------> 20-2------> 18 pizzas
therefore
in the next 55 minutes
if the
average per minute = (18/55) pizzas /minute
Pete beat his previous record
average per minute > (18/55) pizzas /minute
Pete overcome the previous record
average per minute < (18/55) pizzas /minute
Pete will not match the previous record