Ahmad drives from Tampines to Jurong, a total distance of 48 km. He drives the first 24 km at 60 km/h, then drives the remaining 24 km at 30 km/h due to traffic. What is his average speed for the whole journey?
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Worked Solution
Step 1: Find the time for each leg of the journey.
First 24 km at 60 km/h: time = 24 ÷ 60 = 0.4 h
Next 24 km at 30 km/h: time = 24 ÷ 30 = 0.8 h
Step 2: Find the total time.
0.4 + 0.8 = 1.2 h
Step 3: Find the average speed.
Average speed = Total distance ÷ Total time
= 48 ÷ 1.2
= 40 km/h
Correct answer: 40 km/h
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