alleryA train 150 m long runs at 54 km per hour. The time it takes to pass a pole is:
A10 seconds
B8 seconds
C12 seconds
D15 seconds
Answer & Solution
Correct answer: A. 10 seconds
1. To pass a pole the train must cover its own length, 150 m.
2. Convert the speed to metres per second by multiplying by 5/18.
3. 54 x 5 / 18 = 15 metres per second.
4. The time is 150 / 15 = 10 seconds.
5. Forgetting the conversion and dividing 150 by 54 would give about 2.8 seconds, which is the usual slip.
_Source: syllabus Maths, Ch 11 'Direct and Inverse Proportions', S11.3 Inverse Proportion_
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