6th Grade Solving Itinerary Problems Using Comparison: Problem 2

Problem: Two classes are going on a field trip. The school only has one bus that's big enough to hold one class, so as the bus takes one class the other one has to walk. And then, the bus turns around to pick the walking class up. The two classes walk 4 kilometers per hour. When the bus is carrying a class, its speed is 40 kilometers per hour. When the bus is not carrying a class, its speed is 50 kilometers per hour. If the two classes wants to be at their destination in the shortest time possible, then what fraction of the total distance does the first class walk?

Key: 1) Create a sketch; 2) Use speed ratios

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