each of these problems

[navi tasan]

1) You have to solve every one of these problems in less than thirty minutes.
2) You have to solve each of these problems in less than thirty minutes.

Let's say there are five problems.
What is the assignment?
a) To solve the five problems in less than thirty minutes
or
b) To solve one problem in every thirty minutes

 

[jutfrank]

Rephrase the instructions more clearly:

a) You have 30 minutes to solve all five problems.
b) You have 30 minutes to solve each problem.