Subject
Quantitative Aptitude
Topic
Speed & Distance
A train moves past a telegraph post and a bridge 264 m long in 8 seconds and 20 seconds respectively. What is the speed of the train?
A train moves past a telegraph post and a bridge 264 m long in 8 seconds and 20 seconds respectively. What is the speed of the train?
ক)
69.5 km/hrখ)
70 km/hrগ)
79 km/hrঘ)
79.2 km/hrExplanation
Let the length of the train be x metres and its speed by y m/sec. Then, x/y = 8 => x = 8y Now, (x + 264)/20 = y => 8y + 264 = 20y => y = 22. So, Speed = 22 m/sec = 22 x (18/5) km/hr = 79.2 km/hr.Related questions
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