A man can do a job in 50 minutes..?

Question:Bill can do a job in 50 minutes, while Chad can do the same job in 30 minutes. How long will it take them to do the same job working together?...

I'm not really concerned on the actual answer, I would really appreciate it if you could tell me how to actually solve this, and possibly others like this one...thanx ppl...

Answers:
I have created a table for you here http://www.flickr.com/photos/18955982@n0... also see other word problem tables on my flickr acct.

Good Luck
hi
you just have to add the minutes together and divide by the number of people. the only twist is that 2 people can do the job of one in half the time, thus your formula would be:
*(50+30) divided by 2, then divide it in two again. i think that is the trick to the question. also, make sure they want the answer in minutes not hours or seconds or what ever, in that case you would have to multiply or divide by whatever it is they want as the measurement. does that make sense??
In 1 minute Bill can do 1/50 of the job

In 1 minute Chad can do 1/30 of the job

Together in 1 minute they will do 1/50+1/30 = (3+5)/150 = 8/150 of the job

The whole job will be finished in 150/8 = 75/4 = 18.75 minutes

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