I think there certainly are cases where the more experienced one will finish 100x faster!
In actual numbers, that means that anything that takes the senior dev, say, 3 hours, must not take the junior developer more than 7.5 weeks.
Junior devs are really, really bad at certain categories of task, and can totally blow that budget of two months.
Sure, the 100x speed difference might not exist when writing a binary search for a sorted array. However, being able to throw up a small shell pipeline or something instead of trying to write a bespoke program is where the difference starts to come out.
In actual numbers, that means that anything that takes the senior dev, say, 3 hours, must not take the junior developer more than 7.5 weeks.
Junior devs are really, really bad at certain categories of task, and can totally blow that budget of two months.
Sure, the 100x speed difference might not exist when writing a binary search for a sorted array. However, being able to throw up a small shell pipeline or something instead of trying to write a bespoke program is where the difference starts to come out.