working alone takes mark 12 hrs.Beth does it in 10 hours.find hw long it would take them if they worked together

Question

amistre64 · Answer

M = 1/12; B = 1/10

M + B = 22/120.

120 /22 = 5.45 hours round about??

amistre64 · Answer

11/60  55/60 = 5 left

11/5 = 2.2 pqrts of an hour

....5 hours and 27 minutes?  best guess

anonymous · Answer

x             x
---  +  ---- = 1
12          10

multiply each term by 60  (common denominator)
60x     60x  
---  + ---- = 1(60)
12          10

reduce
5x + 6x = 60
11x = 60
x = 5  5/11 hours