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Consider two hot bodies B1 and B2 which have temperatures 100°C and 80°C respectively at t=0. The temperature of the surroundings is 40°C. The ratio of the respective rates of cooling R1 and R2 of these two bodies at t=0 will be 
(a) R1:R2=3:2       (b) R1:R2=5:4
(c) R1:R2=2:3       (d) R1:R2=4:5