Jim's lawn is a rectangle that is 15 5/6 yards long and 10 2/5 yards wide. Jim buys sod in pieces that are 1 1/3 yards wide. How
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Now let's say hmmm
p1 = pipe1 p2 = pipe2 and p3 = pipe3
so, we know p1 can do the whole shebang in 45hours
that simply means, that in 1hr, percentage wise, p1 can do really (1/45)th of the job
ok... now, if we have p1 and p2 working together, they can do the whole thing in 30hrs, so, in 1hr, they both working, have done only (1/30)th of the job, so, what's p2's rate? well
that simply means, p2 can do the whole job in 90 hours... notice, 90 is 45*2, that just means p2 is twice as slow as p1
now.. we know p2 and p3 working together can do the job in 40hrs, what's p3's rate?
well
so p3, can do the whole shebang in 72hrs then
p1 = pipe1 p2 = pipe2 and p3 = pipe3
so, we know p1 can do the whole shebang in 45hours
that simply means, that in 1hr, percentage wise, p1 can do really (1/45)th of the job
ok... now, if we have p1 and p2 working together, they can do the whole thing in 30hrs, so, in 1hr, they both working, have done only (1/30)th of the job, so, what's p2's rate? well
that simply means, p2 can do the whole job in 90 hours... notice, 90 is 45*2, that just means p2 is twice as slow as p1
now.. we know p2 and p3 working together can do the job in 40hrs, what's p3's rate?
well
so p3, can do the whole shebang in 72hrs then