A thief is running away on a straight road in a jeep moving with a speed of $9{\rm{m}}{{\rm{s}}^{ - 1}}.\;$ A police man chases him on a motor cycle moving at a speed of $10{\rm{m}}{{\rm{s}}^{ - 1}}.\;$ If the instantaneous. Separation of the jeep from the motor cycle is 100m, how long will it take for the police man to catch the theif.