Eight hours.
The way to calculate this is to figure out what fraction each does in an hour (1/20 of the job, vs. 1/25 of the job). Add the fractions together to see how much they do together in an hour, then take the reciprocal to find out how many hours it takes them.
3 hours
Machine # 1 works at a rate of 1/2 truckload per hour, while machine 2 works at a rate of 1/4 truckload per hour. The two machines together work at a rate of 3/4 truckload per hour complete the job 1/(3/4) = 1-1/3 hours.
192 minutes or 0.1333333 hours.
Well, darling, if one person takes 3 hours and the other takes 6 hours to paint the fence, then when they join forces it will take them 2 hours to finish the job together. It's simple math, honey. Just add their individual rates of work to get the combined rate and then divide the total job by that rate. Easy peasy lemon squeezy!
10 hours
12 hours
6 hours
They worked long hours in dangerous conditions with no benefits.
The way to calculate this is to figure out what fraction each does in an hour (1/20 of the job, vs. 1/25 of the job). Add the fractions together to see how much they do together in an hour, then take the reciprocal to find out how many hours it takes them.
long worked hours
Not very long
3 hours
Oh not that long, a couple of hours! Thanks for asking!
Oh not that long, a couple of hours! Thanks for asking!
Three thousand workers took one (1) year and 45 days to complete the building working Sundays and holidays!
3-8 hours