Answer:
Well a flea is quite small (about 5mm) and can jump 100 times its height which makes 500mm which is 50 cm high. A fleas average jump takes about 1.75 seconds but that is for the up and down so you need to divide the number by 2 which makes 0.875 so that makes it's highest jump peak at 50cm so therefor it will only get lower as the time passes on to a second.So therefor the answer
=50cm
More than 50 cm :) Flea (Siphonaptera) up to 1,5 m