Ng Peng Liang's answer to roséanne's Primary 6 Maths Speed Singapore question.
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Total distance = 5km/h x 2h = 10km
New speed = 5km/h x (1 - 20%) = 4km/h
New time = 10km ÷ 4km/h = 2.5h
New speed = 5km/h x (1 - 20%) = 4km/h
New time = 10km ÷ 4km/h = 2.5h
Date Posted:
2 years ago
Great explanation
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