Rashed can stuff advertising circulars into envelopes at the rate of 45 envelopers per minute and Reena requires a minute and a half to stuff the same number of envelopes. Working together, how long will it take Rashed and Reena to stuff 300 envelopes?
Solution
Correct Answer: Option B
in 60 seconds Rashed can stuff 45 envelope in 1 seconds Rashed can stuff 45/60=3/4 envelope again, in 90 seconds Reena can stuff 45 envelope in 1 seconds Reena can stuff 45/90=1/2 envelope
Together in one second they can stuff=(3/4+1/2)=5/4 envelope they can stuff 5/4 envelope in 1 second they can stuff 1 envelope in 1X4/5 second they can stuff 300 envelope in 1X4X300/5 second=240 second=4 minutes
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