Problem
2. John can mow his lawn in 3 hours and his sister, Julie, can mow it in 2 hours. How long will it take them to mow their lawn if they work together? A. 1 hour 12 minutes B. 1 hour 15 minutes C. 1 hour 20 minutes D. 1 hour 30 minutes E. 1 hour 35 minutes
Solution
Step 1 ：Let x = hours John and Julie work together
Step 2 ：Rate of John and Julie: \(\frac{1}{3}x + \frac{1}{2}x = 1\)
Step 3 ：Solve for x: \(x = \frac{5}{6}\)
