A train 400m long is travelling at a speed of 60 km/h . How long will it take to cross bridge 600 m long?
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Answer:
90km/h
Step-by-step explanation:
400 = 60
600 = x
400x = 60×600
x = 60×600/400
= 36000/400
= 90
x = 90km/h
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