A train is moving with an uniform speed- It crosses a railway platform 120 metres long in 12 seconds and another platform 170 metres long in 16 seconds- The speed of the train per second is -displaystyle12frac-1-2-m-sec10 m-secdisplaystyle10frac-5-10-m-secdisplaystyle10frac-1-2-m-sec

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A train is moving with an uniform speed. It crosses a railway platform 120 metres long in 12 seconds and another platform 170 metres long in 16 seconds. The speed of the train per second is ___________.1212m/sec10 m/sec10510m/sec1012m/sec

A train is moving with an uniform speed. It crosses a railway platform 120 metres long in 12 seconds and another platform 170 metres long in 16 seconds. The speed of the train per second is ___________.
$12 \frac{1}{2} m / s e c$
10 m/sec
$10 \frac{5}{10} m / s e c$
$10 \frac{1}{2} m / s e c$