if a copier makes 2 copies in 1/3 second, then at the same rate how many copies does it make in 4 minutes?
সঠিক উত্তর: Option A
here, 4 minutes=240 seconds in 1/3 seconds a copier makes 2 copies in 1 seconds a copier makes 2x3/1 copies in 240 seconds a copier makes 2x3x240 copies=1440 copies