Question

martha rakes leaves in 6 hours her brother in 7 hours how long will it take them together to do the job

Answer 1

i came up with 42 im unsure

Answer 2

martha can do 1/6 of the job in 1 hour
brother 1/7 of job in 1 hour
1/6 + 1/7 = 7/42 + 6/42 = 13/42
together they can do 13/42 of job in 1 hour
42/13 = 3 and 3/13
so it takes about 3 hours and 14 min

Answer 3

someone help me

Answer 4

i meant 42/13

Answer 5

you were correct :)

Answer 6

thank you smartcow

Answer 7

help u with what prettychick?