Answer should be 1.5 !!!

Let the trees be x,y

from question : -

eq1 is   x = 3/5 (y)

eq2 after 4 yrs,

x+y = 8

from the 2 equations we get y = 5 and x = 3

according to our equation x= 3/5(y) -> x is the smaller tree.

In 4 yrs x grows 3ft

In 2 yrs x grows ?ft

Ans = 1.5ft.

Correct me if I am wrong.

         hi ans is 1.5 by unitary method

in 4 years (t1=3/5)*t2

this shows that t2 is big tree

now during 4 years t1+t2= 8

then                    t1+(5/3)*t1=8

                           t1=3  t2=5

now in 4yr t1(small tree) grows 3 ft

      therefore in 2 yr t1(small tree )will grow (3/4)*2=1.5