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Question
primary 5 | Maths
| Area & Volume
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Please help me ! Thank you very much !!!!
speed is inverse to time
speed → W:R = 60:100 = 3 : 5
time → W:R:W-R = 5 : 3 : 2
=12.5 : 7.5 : 5
12.5×60 = 7.5×100 = 750m (Ans)
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