Assume X is the number of each bricklayer's workload per day. To build the same wall, the workload of 3 bricklayers in 10 days should equal to 2 bricklayers' in Y days. Thus, 3*10*X=2*Y*X, rearrange it and get Y=15. It takes 2 bricklayers 15 days to build the same wall.
1
that's how long it takes for the earth to go all the way around
It usally takes 21 to 35 days. 28 days is average.
That is how long it takes for the earth to fully complete a rotation around the sun
thats how long it takes for the earth to rotate around the sun.
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120 days
35 days
It takes about 3 days for a robin to build its nest!!
about 4 or 5 days if they worked all day and all night
it takes about 10 to 14 days for a mourning cloak butterfly to get out of cocoon.
It takes a few days, beginning immediately. This is why you shouldn't train the same muscles for a few days. It takes a little less though for slow-twitch fibers, like those of your abs.
It takes a long time...
12 months
it takes about 36 days to get to the moon
Building 5 houses takes 12 x 75 ie 900 man-days. 20 men will thus take 900/20 ie 45 days.
It took 273 days for them to build the pyramid