Question

A train crosses a platform of length  x  m in  9 seconds . The same train crosses a tunnel of length  (2x + 20)  m in  11 seconds . If the speed of the train is  28 m/sec , find the time taken to cross a man running in the same direction at  4 m/sec .

A 5 secs
B 9 secs
C 10 secs
D 18 secs
E None of these
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