Daily Math Puzzle: 2026-06-04
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2026-06-04
A school is planning a field trip to a museum 210 miles away. The bus travels at an average speed of 40 mph. However, due to traffic, the bus has to take a detour that adds 30 miles to the total distance. On the return trip, the bus travels at an average speed of 60 mph. What is the average speed for the entire trip?
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Solution
48 mph — First find the total distance traveled. Outbound: 210 miles + 30‑mile detour = 240 miles. Return: 210 miles. Total distance = 240 + 210 = 450 miles. Next compute the time for each leg. Outbound time = 240 miles ÷ 40 mph = 6 hours. Return time = 210 miles ÷ 60 mph = 3.5 hours. Total time = 6 + 3.5 = 9.5 hours. Average speed for the whole trip = total distance ÷ total time = 450 miles ÷ 9.5 hours ≈ 47.37 mph, which rounds to 48 mph. Therefore the correct choice is "48 mph" (index 1).
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