 
<translate> Ngụkọta ọrụ nke igwe abụọ ahụ rụrụ n'otu nkeji = 30 + 20 = 50 Ọnụ ọgụgụ nke akwụkwọ ndị a chọrọ = 2000 Oge = 2000/50 = 40 mins Ya mere azịza ya bụ (B). <eng> Total work done by both machines in a minute = 30 + 20 = 50 copies
Total number of copies required = 2000
Time = 2000/50 = 40 mins So the answer is (B). 