Question

Please help

1.
Tom can mow his lawn in 3 hours. Bob can mow the same lawn in 4 hours. If they work together, how long will it take them to mow the lawn?
A) 1 1/2 hours
B) 1 2/3 hours
C) 1 5/7 hours
D) 1 4/5 hours

Answer 1

c

Answer 2

1 hr, Tom mows 1/3 of his lawn
bob mows 1/4 of his lawn
they how 7/12 of their lawn
thus in 12/7 hours they will mow their entire lawn
that's c

Answer 3

THANK U A_CLAN :)