A group of ants, each 1/3 centimeters in length, crosses a sidewalk in single file, each right behind the next, at a speed of 30 cm/min. If the sidewalk is 1.5 meters wide, how long does it take for 30 ants to all make it across? Choose the correct choice from the following choices.
A) 2 min B) 3 min C) 4 min D) 5 min E) 6 min
6 min   6 min   d = 30 * 1/3 cm + 150 cm = 180 cm   T = 180 cm / 30 cm/min = 6 min
<result>E</result>
A group of ants, each 1/3 centimeters in length, crosses a sidewalk in single file, each right behind the next, at a speed of 30 cm/min. If the sidewalk is 1.5 meters wide, how long does it take for 30 ants to all make it across?