Let radius of circles be r_{1 }and r_{2}

Given sum of radius = 140cm

r_{1}+r_{2}=140 .......(i)

difference in circumferences=88

2πr_{1}-2πr_{2}=88

r_{2}=63 cm in (ii) r_{1}=63+14=77cm

Diameter of circle (i)=2r_{1}=2x77=154cm

Diameter of circle (i)=2r_{2}=2x63=126cm