Solution

23882

First name
Timelords
School
Pluckley Church of England Primary School
Country
Age
10

3.75m divided by 3 equals 1.25m
1.25m times by 2 equals 2.50m Answer=2.50m

1.20m divided by 3 equals 40cm
40cm times by 2 equals 80cm Answer=80cm

I knew that the oringinal jump would be two thirds of the furthest jump. So all I did was divide by three and then times by two simply bringing the single third up to the two thirds(the answer).