Three shafts numbered as 1, 2 and 3, The speed of the shaft 2 always remains same. Hence, Teeth 48 and 12 in the shaft 2 will be having same speed.
N1/N2 = 4
N2/N3=5
N1/N3=20
Torque is inversely proportional to speed
Hence, T1/T3 = N3/N1
T1 = 100 Nm
So, T3 = 2000 Nm
Answer: (D)
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