Question

It takes Gabriella seven hours to harvest a

field. Huong can harvest the same field in
nine hours. If they worked together how
long would it take them?
A) 4.93 hours B) 3.94 hours C) 3.39 hours
D) 5.07 hours

Answer 1

B

Explanation:

Gabriella's one hour work=1/7

Huong's one hour work=1/9

one hour work of both=1/7+1/9=(9+7)/63=16/63 th

so they can harvest the same field in time=63/16=3.9375 hours≈3.94 hours.

B