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  1. In what time will a 100 metre long train running with a speed of 50 km/hr cross a pillar ?
    1. 7.0 seconds
    2. 72 seconds
    3. 7.2 seconds
    4. 70 seconds
Correct Option: C

Speed of train = 50 kmph

=
50 × 5
m./sec.
18

=
125
 m./sec.
9

∴ Required time =
(100/125)
seconds
9

=
100 × 9
 seconds
125

= 7.2 seconds


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