The given curves are, y=kx2,x=ky2
To find the point of intersection of the curves, put y from the first curve into second, to get
x=k(k2x4)
⇒x=0 or x3=(k1)3⇒x=k1
Hence, y=0 or y=k(k1)2=k1
Therefore, point of intersection is (k1,k1).

Hence, the required area is ∫0k1(y2−y1)dx=1
⇒∫0k1(kx−kx2)dx=1
⇒(k13/2x3/2−3kx3)0k1=1
⇒3k22−3k21=1
⇒k2=31
⇒k=±31
But, given k>0
So, k=31.