 
<translate> Jimlar aikin da na'urorin biyu suka yi a cikin minti daya = 30 + 20 = kwafi 50 Jimlar adadin kwafi da ake bukata = 2000 Lokaci = 2000/50 = 40 mins Don haka amsar ita ce (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). 