  Galactic black hole candidate MAXI J1910-057/Swift J1910.2-0546 was
simultaneously discovered by MAXI/GSC and Swift/BAT satellites during its first
outburst in 2012. We study the detailed spectral and temporal properties of the
source in a broad energy range using archival data from Swift/XRT, MAXI/GSC and
Swift/BAT satellites/instruments. Low frequency quasi periodic oscillations are
observed during the outburst. The combined 1-50 keV spectra are analyzed using
the transonic flow solution based Two Component Advective Flow (TCAF) model.
Based on the variations of soft and hard X-ray fluxes, their hardness ratios
and the variations of the spectral model fitted parameters, we find that the
source has evolved through six spectral states. We interpret this spectral
state evolution to be a result of two connected outbursts where the leftover
matter from a primary outburst is released from the pile-up radius due to a
sudden rise of viscosity causing a reflare/secondary outburst. We show a
possible configuration of the evolution of accretion flow during the outburst.
From the spectral analysis with TCAF model, we estimate the mass of the black
hole to be $9.97^{+3.51}_{-3.24}$ $M_\odot$ , and the source distance is
estimated to be $3.4-9.6$~kpc from transition luminosity considerations.
