Answer:
Heat Loss = Heat Gain
(60 - T) K1 M1 = (T - 10) K2 M2
M1 = metal M2 = liquid
K1 = metal K2 = liquid
(60 - T) K1 * 1 = (T - 60) K2 * 5
60 K1 - T K1 = 5 T K2 - 300 K2
T (5 K2 + K1) = 300 K2 + 60 K1
T = (300 K2 + 60 K1) / (5 K2 + K1)
Need to find largest T
(probably ethanol and iron - you will need to check)