On Tuesday, 448 school children took a field trip to the science museum. All of the children rode on buses that held 32 students

The time required would be 2:30. If we assume they both take 3 hours, working together would halve the time. However, if Jai requires an additional hour due to a slower pace, adding that brings the total to 2:30.

15.25 is the solution to the problem

Wanda encounters Hector after 4.5 hours. Wanda will not be able to reach Hector before the end of the race because at his current pace (16m/h), he would finish when both reach mile 72, while the race is only 42 miles.
To catch up with Hector at the finish line, Wanda must raise her speed to 21m/h. I have included the answers.