Question

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

Answer 1

M = 1/12; B = 1/10

M + B = 22/120.

120 /22 = 5.45 hours round about??

Answer 2

11/60 55/60 = 5 left

11/5 = 2.2 pqrts of an hour

....5 hours and 27 minutes? best guess

Answer 3

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