A train speeds past a pole in 11 seconds and a platform 120 m long in 22 seconds. Its length is?  Choose the most appropriate option: A) 128 B) 177 C) 199 D) 120 E) 150
Let the length of the train be x meters and its speed be y m/sec.   They, x / y = 11 =&gt; y = x/11   x + 120 / 22 = x / 11   x = 120 m.   Answer:120
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A train speeds past a pole in 11 seconds and a platform 120 m long in 22 seconds. Its length is?