A piece of ice falls from a height h so that it melts completely. Only one-quarter of the heat produced is absorbed by the ice and all energy of ice gets converted into heat during its fall. The value of h is [Latent heat of ice is 3.4x105J/Kg and g=10N/Kg]
(a) 544 km
(b) 136 km
(c) 68 km
(d) 34 km