Earl can stuff advertising circulars into envelopes at the rate of 36 envelopes per minutes and Ellen requires a minutes and half to stuff the same number of envelops.Working together,how long will it take Earl and Ellen to stuff 180 envelopes	Choose the correct choice:
A) 6 minutes
B) 5 minutes
C) 7 minutes
D) 3 minutes
E) 4 minutes
earl takes 1 min. for 36 envelopes.   ellen takes 3/2 mins for the same. so ellen can stuff ((36)/(3/2)) in 1 min. i.e., 24 envelopes a min.   so both of them when work together can stuff 36+24= 
<gadget id="calculator">36+24</gadget>
<output>60</output>
60 envelopes in 1 min.   for 180 envelopes they will take 180/60 mins. i.e., 3 mins.   ANSWER:3 minutes
<result>D</result>
Earl can stuff advertising circulars into envelopes at the rate of 36 envelopes per minutes and Ellen requires a minutes and half to stuff the same number of envelops.Working together,how long will it take Earl and Ellen to stuff 180 envelopes