roadbed in 7 hours. surveyor needs 8 hours to survey the same stretch of road. if the two work together, find how long it takes them to complete the job.

Question

Please help 

Answer 1

(1/7)x+(1/8)x=1

8x+7x=56

15x=56

x=56/15

x=3 11/15 hours or 3 hours and 44 minutes