04 Try it yourself Interactive

Two or three workers, start to finish

Give each person their solo time. The console takes the LCM as the job, converts each time to a whole-number rate, adds them and divides. Set C to zero for a two-person question. The closing line states the window your answer has to fall inside.

A in 10 days, B in 15 days
30 units · 6 days
Every rate comes out whole because the job is the LCM of the times. That is the only reason for choosing it.
Press Next to work through it one step at a time.
Total units–
Units/day–
Together–
Answer–
step 0 / 0