Question

a train 120 M long is moving at a speed of 54 km/hour. the time taken to pass a bridge of 200 m long is :

Answer 1

( ( 120 + 200 ) ÷ 1000 ) ÷ 54
= 0.00592592593 hrs
= 21.33 sec

Answer 2

train moving speed = 54km/hr
how many time it will take to cross 200m long bridge?
1km = 1000 m
54km = 1 hour or 60 min then
$1km = 1.7min$
for 200 mtr long =
$200 \times 1.7 = 340$