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📌 Selective Test 2 · Q18 — A driver goes 120 km at 60 km/h, then 100 km at 50 km/h. What is the AVERAGE speed for the whole trip?
leg 1: 120 ÷ 60 = 2 h
leg 2: 100 ÷ 50 = 2 h
total: 220 km in 4 h
220 ÷ 4 = 55 km/h
not (60+50)÷2 !
Ms Lee ✏️
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