Time needed to complete \(\frac{14}{15}\) at combined rate: \(\frac{14/15}{3/20} = \frac{14}{15} \times \frac{20}{3} = \frac{280}{45} = \frac{56}{9} \approx 6.22\) hours
Related Articles
- Bob works alone for 1 hour: \(\frac{1}{15}\) of the task
- Combined work rate when both work: \(\frac{1}{12} + \frac{1}{15} = \frac{5+4}{60} = \frac{9}{60} = \frac{3}{20}\)
- Remaining task after 1 hour: \(1 - \frac{1}{15} = \frac{14}{15}\)
- Total time: \(1 + \frac{56}{9} = \frac{65}{9} \approx 7.22\) hours
- #### \(\frac{65}{9}\) hours (approximately 7.22 hours)
- A car travels from City A to City B at an average speed of 60 km/h and returns at 80 km/h. The total travel time is 7 hours. What is the distance between the two cities?
