The total force will be divided equally between the 2 springs in parallel. Since the force is divided in half, the distance moved will also be halved. The springs in series were compressed 10 cms, so the springs in parallel will be compressed 5 cms. - See more at: http://www.psychometric-success.com/aptitude-tests/mechanical-reasoning-tests-springs.htm#sthash.IuonNqdq.dpuf