Two trains of lengths 108 m and 112 m are running in opposite direction (i.e. to each other). The speed of one of those trains is 45 km/hr. and the time taken by them to cross each other is 8 seconds. What is the speed of the other train?
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50 km/hr.
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54 km/hr.
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60 km/hr.
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64 km/hr.
B
Correct answer
Explanation
When trains move in opposite directions, their relative speed is the sum of individual speeds. Total distance to cover = 108 + 112 = 220 m. Time taken = 8 seconds. Relative speed = 220/8 = 27.5 m/s = 27.5 × (18/5) = 99 km/hr. If one train's speed is 45 km/hr, the other train's speed = 99 - 45 = 54 km/hr.