Problem Archive

Browse through our collection of past weekly challenges. Each problem comes with student solutions and detailed explanations.

Upper Primary 2025-06-01

Food Truck Festival Challenge

Two food trucks are catering at a local festival.
Truck A can serve a full lunch to 160 people in 4 hours.
Truck B can serve the same number of people in 2.5 hours.
If they work together (at full speed), how long will it take them to serve 160 people?

Stretch my thinking...
What if there were 200 people? What about 500?

Enabling Prompts

For students who need help getting started:

How many people can Truck A serve in 1 hour? What about Truck B?
If both trucks work for 1 hour together, how many people would they serve in total?

Extending Prompts

For students ready to go deeper:

Is the combined time exactly half of Truck A's time? Why or why not?
If you added a third truck that could serve 160 people in 8 hours, would it make a big difference to the total time? Explain your reasoning.