Solved IB ACIO Question
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Q · Arithmetical Reasoningmedium · 45s
A train running at 72 km/h crosses a platform 300 m long in 30 seconds. Find the length of the train.
TopicArithmetical Reasoning
Question Typemultiple choice
Difficultymedium
Marking+1 / −0.25
Test Duration30 min
Step-by-Step Solution
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Speed of train = 72 km/h = (72 × 1000) / 3600 = 20 m/s
Time taken = 30 seconds
Distance covered = Speed × Time = 20 × 30 = 600 m
But distance covered = Length of train + Length of platformSo, Length of train + 300 = 600Length of train = 600 – 300 = 300 m
Final Answer: Option B - 300 m