Question 967600
"pave a highway" and "the same job", each is ONE job.


For a rate r, of one worker in JOBS per DAY, any number n of workers working at the same time on the job make the rate nr.


{{{20r*30=1=15r*t}}}, using t for the number of days.
Observe that this follows uniform rate relationship for doing work,
RT=J rate time job-quantity.