A family of 5 wants to deliver 12 baskets of fruits (each basket 1.5 kg) to Grandmother’s house 3 km away. They use a cart that can carry 4 baskets at a time. If it takes 5 minutes for each round trip (including loading and unloading) and they walk 3 km at 3 km/h, how many minutes will they take to deliver all baskets and return home?
Answer
75 minutes
The correct answer is 75 minutes — Total time = 15 + 60 = 75 minutes.
Step-by-step solution
- Determine number of round trips: ceil(12 ÷ 4) = 3.
- Time for loading/unloading: 3 trips × 5 minutes = 15 minutes.
- Walking time for 3 km at 3 km/h = 1 hour = 60 minutes.
- Total time = 15 + 60 = 75 minutes.
Common mistake: Failing to count round trips correctly or neglecting walking time
Concept tested: Combining travel time and transport cycles
Published · How this solution was prepared and checked
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