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First,you know that you need to find out one half of the original answer, so to find that you have to find a third of the new answer (equivalent to one half of the original answer). To do that, you have to divide 3.75 by 3. so once you have done that, you should have got the answer 1.25.

Now, you have to take away 1.25 from 3.75. now once you have done that you should have the original answer from bens original jump. Now you should have the answer 2.5 meters. If you do not have that answer check your work.

Here is an example of how to do it:

3.75/3=1.25 (1/2 of the original answer)
3.75-1.25=2.5 (The original answer)