A 120 metre long train running at 40 km/h will cross a bridge 80 m long in

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RRB TC CC Exam (Patna) 2006 click here to view all questions

A 120 metre long train running at 40 km/h will cross a bridge 80 m long in

A15 seconds

B18 seconds

C13 seconds

D20 seconds

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Answer is : 18 seconds Total Distance = Train length + bridge distance                       = 120 metre + 80 metre                       = 200 metre. Speed Of Train = 40 km/h                        $=\frac{(40*1000)}{(60 *60)} m/s$ Time To Cross a bridge = $(distance)\over(time)$                                      =$\frac{\frac{200}{ (40*1000)}}{(60 *60)}$                                     $=\frac{(200 * 60 * 60)}{(40 * 1000)}$                                      = 18s Akilesh Kharvi ? answered Nov 4 '2016 at 23:30 All Comments

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