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 360 envelopes
a)6 minutes
b)5 minutes
c)7 minutes
d)3 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 envlpes a min.
  so both of them when work together can stuff 36+24=60 envelopes in 1 min.
  for 360 envelopes they will take 360/60 mins. i.e., 6 mins.
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