Question 183924
In 1 hr honda does 1/10 the job.
In 1 hr brand x does 1/19 the job.
1/10 + 1/19 
19/190 + 10/190 = 29/190 of the job done in 1 hr working together.
190/29 = time in hrs it takes both of them to do the job.
.
Ed