D|   |___________|___________|___________||
A|   |___________|___________|___________||
E|2/4|12____15___|12____15___|12____15___||:
B|   |___________|___________|___________||
#|   |___________|___________|___________||
      .  .  .  .  .  .  .  .  .  .  .  .
C|   |4________________|4________________||
G|   |_________4_______|_________4_______||
D|3/4|_________________|_________________||:
A|   |_________________|_________________||
E|   |_________________|_________________||

Each dot at the middle of the tab represents an eight note.
You can also invert the exercise:

D|   |_________________|_________________||
A|   |_________________|_________________||
E|3/4|12_______15______|12_______15______||:
B|   |_________________|_________________||
#|   |_________________|_________________||
      .  .  .  .  .  .  .  .  .  .  .  .
C|   |4__________|4__________|4__________||
G|   |______4____|______4____|______4____||
D|2/4|___________|___________|___________||:
A|   |___________|___________|___________||
E|   |___________|___________|___________||
 

(c) Diego Souto. All rights reserved.